Document And Entity Information Statement [Table] Statement [Line Items] Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Is Entity's Reporting Status Current? Entity Filer Category Entity Common Stock, Shares Outstanding Document Fiscal Period Focus Document Fiscal Year Focus CONDENSED CONSOLIDATED BALANCE SHEETS Assets [Abstract] ASSETS Current Assets Cash and cash equivalents Cash and cash equivalents Restricted Cash and Cash Equivalents, Current Restricted cash Short-term investments Short-term investments Accounts receivable - trade, net of allowance of $51 and $51, respectively Accounts receivable - trade, net of allowance of $32 and $33, respectively Inventories Inventories Inventories Prepaid Taxes Prepaid income tax Prepaid expenses and other current assets Assets, Current Total current assets Property, plant and equipment, net of accumulated depreciation of $37,980 and $37,980, respectively Property, plant and equipment, net Property, plant and equipment, net Land use rights, net Intangible assets, net Deferred income tax assets Deferred income tax assets Other assets, net Assets TOTAL ASSETS LIABILITIES AND STOCKHOLDERS' EQUITY Current liabilities Long-term Debt, Current Maturities Current portion of notes payable and long-term debt Current portion of notes payable and long-term debt Accounts payable Accrued Income Taxes Accrued income taxes Accrued liabilities. Accrued liabilities Total accrued liabilities Liabilities, Current Total current liabilities Notes payable and long-term debt, less current portion Notes payable and long-term debt, less current portion Long term portion of notes payable and long-term debt Liabilities TOTAL LIABILITIES Stockholders' equity: Preferred Stock; 5,000 shares authorized at $0.001 par value; no shares issued and outstanding at December 31, 2016 or 2015 respectively Preferred Stock; 5,000 shares authorized at $0.001 par value; no shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively Common Stock; 45,000 shares authorized at $0.001 par value; 16,839 and 16,839 shares issued and outstanding at December 31, 2016 and 2015 respectively Common Stock; 45,000 shares authorized at $0.001 par value; 19,634 and 19,451 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively Additional Paid in Capital Additional paid-in capital Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net of Tax Accumulated other comprehensive income Retained Earnings Accumulated Deficit Retained earnings Stockholders' Equity Attributable to Parent Ending balance, value Beginning balance, value TOTAL STOCKHOLDERS' EQUITY Liabilities and Equity TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Allowance for Doubtful Accounts Receivable Allowance for doubtful accounts Preferred Stock par value Preferred Stock shares authorized Preferred Stock shares issued Preferred Stock shares outstanding Common stock par value Common stock shares authorized Common stock shares issued Common stock shares outstanding CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS Revenues Revenue, net Cost of Goods and Services Sold Cost of goods sold Gross Profit Gross profit Operating Expenses [Abstract] Operating expenses Research and development Research and development Sales and marketing General and administrative Operating Expenses Total operating expenses Operating Income (Loss) Income from operations Other income (expense) Other income (expense) Investment Income, Interest Interest income Interest Expense Interest expense Amount of income (expense) related to other nonoperating activities classified as other in the other income (expense) classification. Other Nonoperating Income Expense Other Other income (expense), net Other income and expense, net Other income (expense), net Total other income (expense), net Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income before income taxes Income tax benefit Income tax expense Net Income (Loss) Available to Common Stockholders, Basic Net income Net income Net income per share Basic Net income per share basic Basic Diluted Net income per share diluted Diluted n/a Weighted Average Shares Used To Compute Net Income Per Share [Abstract] Weighted average shares used to compute net income per share: Weighted Average Number of Shares Outstanding, Basic Weighted average shares used to compute net income per share: basic Basic Weighted Average Number of Shares Outstanding, Diluted Weighted average shares used to compute net income per share: Diluted Diluted CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Gain (loss) on foreign currency translation adjustment Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income (loss) CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common stock Additional Paid In Capital [Member] Additional paid-in capital Accumulated Other Comprehensive Income [Member] Accumulated other comprehensive gain (loss) Retained Earnings [Member] Retained earnings Shares, Outstanding Ending balance, shares Beginning balance, shares Stock options exercised, net of shares withheld for employee tax Exercised Stock options exercised, net of shares withheld for employee tax, in shares Stock options exercised, value Stock options exercised, net of shares withheld for employee tax, value Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Issuance of restricted stock, net of shares withheld for employee tax, in shares Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Issuance of restricted stock, net of shares withheld for employee tax, value Stock based compensation Share-based compensation (Loss) gain on foreign currency translation adjustment, net of tax Foreign currency translation adjustment Net income Net income CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Operating activities: Net income before taxes Net income Adjustments to reconcile net income to net cash provided by (used in) operating activities: Adjustments to reconcile net income to net cash provided by operating activities: Provision for obsolete inventory Lower of cost or market reserve adjustment to inventory Depreciation and amortization Depreciation and amortization Increase in deferred tax asset Deferred income taxes, net Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Loss (gain) on disposal of assets Share-based compensation expense Total share-based compensation expense Share-based compensation Unrealized foreign exchange (gain) loss Unrealized foreign exchange gain Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable, trade Increase (Decrease) in Prepaid Taxes Prepaid income tax Increase (Decrease) in Inventories Inventories Increase (Decrease) in Other Current Assets Other current assets Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Income Taxes Payable Accrued income taxes Increase (Decrease) in Accrued Liabilities Accrued liabilities Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Investing activities: Maturities of short-term investments Maturities of short-term investments Payments to Acquire Property, Plant, and Equipment Purchase of property, plant and equipment The cash outflow for acquisition of land use right. Payments To Acquire Land Use Rights Purchase of land use rights Proceeds from disposal of equipment Increase (Decrease) in Deferred Charges Deposits and prepaid for equipment Payments to Acquire Intangible Assets Purchase of intangible assets Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Financing activities: Proceeds from issuance of notes payable and long-term debt Repayments of Debt Principal payments of long-term debt and notes payable Proceeds from line of credit borrowings Proceeds from line of credit borrowings Repayments of Lines of Credit Repayments of line of credit borrowings Repayments of outstanding balance Repayments of Bank Debt Repayments of bank acceptance payable Exercise of stock options Exercise of stock options Payments Related to Tax Withholding for Share-based Compensation Payments of tax withholding on behalf of employees related to share-based compensation Proceeds from common stock offering, net Proceeds from common stock offering, net Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Effect of exchange rate changes on cash Effect of exchange rate changes on cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash at end of period Cash, cash equivalents and restricted cash at beginning of period Total cash, cash equivalents and restricted cash shown in the statement of cash flows Supplemental disclosure of cash flow information: Cash paid for received from Cash Paid For Received From Cash paid for: Interest, net of capitalized amounts Interest Income Taxes Paid Net Income taxes Non-cash investing and financing activities: The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services related to property and equipment additions received that are used in an entity's business. Increase Decrease In Accounts Payable Related To Property And Equipment Additions Net change in accounts payable related to property and equipment additions Organization, Consolidation and Presentation of Financial Statements [Abstract] Business Description and Basis of Presentation [Text Block] Description of Business Accounting Policies [Abstract] Significant Accounting Policies Significant Accounting Policies Revenue Recognition Revenue from Contract with Customer [Text Block] Revenue Recognition Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Abstract Cash and Cash Equivalents Disclosure Cash, Cash Equivalents and Restricted Cash Earnings Per Share Earnings Per Share Inventory Disclosure [Abstract] Inventory Disclosure [Text Block] Inventories Property, Plant and Equipment [Abstract] Property, Plant and Equipment Property, Plant & Equipment Goodwill and Intangible Assets Disclosure [Abstract] Intangible Assets Intangible Assets Debt Disclosure [Abstract] Debt Disclosure [Text Block] Notes Payable and Long-Term Debt Payables and Accruals [Abstract] Accrued Liabilities Accrued Liabilities OTHER INCOME AND EXPENSE Other Income and Expense Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Share-Based Compensation Share-Based Compensation Income Tax Disclosure [Abstract] Income Tax Disclosure [Text Block] Income Taxes Segment Reporting [Abstract] SEGMENT AND GEOGRAPHIC INFORMATION Geographic Information Commitments and Contingencies Disclosure [Abstract] COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES Subsequent Events [Abstract] Subsequent Events Business Overview Business Overview Interim Financial Statements Interim Financial Statements Policy Text Block Interim Financial Statements Use of Estimates Recent accounting pronouncements Recent Accounting Pronouncements Revenue Recognition. Revenue Recognition. Disaggregation of Revenue [Table Text Block] Schedule of revenue classified by major product category Schedule of Cash and Cash Equivalents [Table Text Block] Schedule of cash and cash equivalents Computation of basic and diluted net loss per share Schedule of Computation basic and diluted net loss per share Schedule of inventories Schedule of property, plant and equipment Schedule of Finite-Lived Intangible Assets [Table Text Block] Intangible assets Schedule of notes payable and long-term debt Maturities of notes payable and long-term debt Schedule of accrued liabilities Schedule of other income and expense Summary of option activity Summary of RSU activity Summary of RSU/RSA activity Schedule of employee stock-based compensation expenses Revenue from External Customers by Geographic Areas Revenue information by geographic region Long-lived Assets by Geographic Areas [Table Text Block] Long-lived assets by geographic region Represents the number of networking end markets. Number of networking end markets Disaggregation of Revenue [Table] Disaggregation of Revenue [Line Items] Disaggregation of Revenue