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Note 7 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2019
Jan. 31, 2018
Sep. 29, 2019
Sep. 30, 2018
Sep. 29, 2019
Sep. 30, 2018
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 924   $ 924  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition         1 year 146 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 3.77  
Proceeds from Stock Options Exercised     388 $ 64 $ 866 $ 1,357
Restricted Stock [Member]            
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 188   $ 188  
Restricted Stock [Member] | The 2014 Long-term Incentive Plan [Member]            
Stock Issued During Period, Shares, Restricted Stock Award, Gross 20,000 17,500        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 11.12 $ 7.16        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years