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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%