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Note K - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 06, 2015
Mar. 29, 2015
Mar. 27, 2015
Mar. 10, 2015
Sep. 25, 2016
Sep. 27, 2015
Sep. 25, 2016
Sep. 27, 2015
Mar. 29, 2015
Employee Stock Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years                
Allocated Share-based Compensation Expense         $ 38,000 $ 38,000 $ 76,000 $ 106,000  
Excluding Dividend [Member]                  
Share Price     $ 48.56            
Special Cash Dividend [Member]                  
Common Stock, Dividends, Per Share, Declared     25 $ 25          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   75,745         0   50,000
Allocated Share-based Compensation Expense         173,000 $ 173,000 $ 346,000 $ 376,000  
Share Based Compensation Total Unamortized Compensation Expense         $ 735,000   $ 735,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition             1 year 255 days    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price   $ 35.576             $ 53.89
Share Based Compensation Arrangement by Share Based Payment Award Option Life                 5 years
Share Price     $ 73.56