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Note 8 - Shareholders' Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2014
Jun. 26, 2016
Jun. 28, 2015
Jun. 26, 2016
Jun. 28, 2015
Employee Stock Option [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 146 days  
Restricted Stock [Member]          
Stock Issued During Period, Shares, Restricted Stock Award, Gross 49,200        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 3.24        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options   $ 27,000   $ 27,000  
Excess Tax Benefit from Share-based Compensation, Financing Activities       0 $ 0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options   824,000   $ 824,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 2.01  
Proceeds from Stock Options Exercised   $ 61,000 $ 0 $ 75,000 $ 8,000