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Note 1 - Summary of Operations and Significant Accounting Policies (Details Textual)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 02, 2017
USD ($)
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Allowance for Doubtful Accounts Receivable, Current   $ 292 $ 277
Foreign Currency Transaction Gain (Loss), before Tax   (10) 86
Advertising Expense   26 32
Research and Development Expense, Gross   5,142 6,155
Customer Funded Research and Development Expense Included in Cost of Goods Sold   405 209
Research and Development, Revenue   $ 405 $ 209
Number of Dilutive Stock Options Included in Diluted Earnings Per Share Calculation | shares   1,035,711 1,238,804
Number of Shares Due to Dilutive Stock Options Included in Diluted Earnings Per Share Calculation | shares   330,676 135,458
Number of Dilutive Restricted Stock Units Included in Diluted EarningsPerShareCalculation | shares     15,900
Number of Shares Due to Dilutive Restricted Stock Units Included in Diluted Earnings Per Share Calculation | shares     9,538
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares   824,500 1,332,281
Number of Operating Segments   2  
Deferred Tax Assets, Gross   $ 22,645 $ 33,358
Deferred Tax Assets, Valuation Allowance   $ 22,636 $ 33,331
Reclassification of Current Deferred Tax Assets to Noncurrent [Member] | December 31, 2017 [Member]      
Prior Period Reclassification Adjustment $ 32    
Reclassification of Current Deferred Tax Assets to Noncurrent [Member] | December 31, 2016 [Member]      
Prior Period Reclassification Adjustment 94    
Current Period Reclassification Adjustment 94    
Accounting Standards Update 2016-09 [Member]      
Deferred Tax Assets, Gross 1,123    
Deferred Tax Assets, Valuation Allowance $ 1,123    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares   0  
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]      
Number of Major Customers   1 1
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Large Defense Primary Contractor, 1 [Member]      
Concentration Risk, Percentage   18.00% 12.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Large Defense Primary Contractor, 2 [Member]      
Concentration Risk, Percentage   3.00% 13.00%