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Note 8 - Shareholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 25, 2018
Jan. 31, 2018
Sep. 30, 2018
Jul. 01, 2018
Jul. 02, 2017
Jul. 01, 2018
Jul. 02, 2017
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options       $ 844   $ 844  
Employee Service Share-based Compensation, Nonvested Awards, Compensation 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           $ 4.22  
Excess Tax Benefit from Share-based Compensation, Financing Activities           $ 0 $ 0
Proceeds from Stock Options Exercised       354 $ 248 1,293 $ 989
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 7.16          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options       $ 91   $ 91  
The 2004 Long-term Incentive Plan [Member] | President [Member] | Scenario, Forecast [Member]              
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost     $ 182        
The 2014 Long-term Incentive Plan [Member] | Restricted Stock [Member]              
Stock Issued During Period, Shares, Restricted Stock Award, Gross   17,500          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years          
Subsequent Event [Member] | The 2004 Long-term Incentive Plan [Member] | President [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number 200,000            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Accelerated Vesting, Weighted Average Grant Date Fair Value $ 10            
Option Accelerated Vesting, Stock Price Trigger $ 10            
Option Accelerated Vesting, Threshold Trading Days 15 days