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Note 1 - Summary of Operations and Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares
Allowance for Doubtful Accounts Receivable, Current | $ 277 | $ 300
Goodwill and Intangible Asset Impairment | 0 | 150
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 405 |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 373 |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 352 |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 340 |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 321 |
Foreign Currency Transaction Gain (Loss), before Tax | 86 | 48
Advertising Expense | 32 | 59
Research and Development Expense, Gross | 6,155 | 6,112
Customer Funded Research and Development Expense Included in Cost of Goods Sold | 209 | 509
Research and Development, Revenue | $ 209 | $ 509
Number of Dilutive Stock Options Included in Diluted Earnings Per Share Calculation | shares | 1,238,804 | 1,312,282
Number of Shares Due to Dilutive Stock Options Included in Diluted Earnings Per Share Calculation | shares | 135,458 | 260,318
Number of Dilutive Restricted Stock Units Included in Diluted EarningsPerShareCalculation | shares | 15,900 | 32,800
Number of Shares Due to Dilutive Restricted Stock Units Included in Diluted Earnings Per Share Calculation | shares | 9,538 | 15,385
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares | 1,332,281 | 945,687
Number of Operating Segments | 2 |
Asset Impairment Charges | $ 0 | $ 0
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |
Number of Major Customers | 2 | 1
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Large Defense Primary Contractors, 1 and 2 [Member] |  |
Concentration Risk, Percentage | 25.00% |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Large Defense Primary Contractor, 1 [Member] |  |
Concentration Risk, Percentage |  | 23.00%

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