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Note M - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 30, 2015
Mar. 27, 2015
Mar. 10, 2015
Dec. 27, 2015
Dec. 28, 2014
Dec. 27, 2015
Dec. 28, 2014
Mar. 29, 2015
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
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition           2 years 120 days    
Allocated Share-based Compensation Expense       $ 173,000 $ 228,000 $ 549,000 $ 629,000  
Share Based Compensation Total Unamortized Compensation Expense       $ 1,254,000   $ 1,254,000    
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-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period               4 years
Share Price   $ 73.56