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Note M - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended
Jun. 08, 2018
Dec. 22, 2017
Dec. 20, 2017
Nov. 01, 2017
Mar. 29, 2015
Mar. 27, 2015
Mar. 10, 2015
Jun. 24, 2018
Jun. 25, 2017
Allocated Share-based Compensation Expense, Total               $ 81,000 $ 99,000
Share Based Compensation Total Unamortized Compensation Expense               $ 19,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         50,000      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price         $ 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     $ 83.20     $ 73.56      
Common Stock, Dividends, Per Share, Declared $ 0.25             $ 0.25 $ 0
Special Cash Dividend [Member]                  
Common Stock, Dividends, Per Share, Declared     5 $ 5   25 $ 25    
Excluding Dividend [Member]                  
Share Price     $ 78.20     $ 48.56      
Employee Stock Option [Member]                  
Allocated Share-based Compensation Expense, Total               $ 38,000 $ 38,000
Employee Stock Option [Member] | The 2010 Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   68,498     75,745        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price   $ 33.438     $ 35.58        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period   64,384     50,000        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price   $ 35.58     $ 53.89