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Note M - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 29, 2019
Dec. 23, 2018
Dec. 29, 2019
Dec. 23, 2018
Mar. 31, 2019
Share-based Payment Arrangement, Expense $ 29,000 $ 29,000 $ 87,000 $ 133,000  
Share Based Compensation Total Unamortized Compensation Expense 198,000   $ 198,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     0   10,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price       $ 89.90
Share-based Payment Arrangement, Option [Member]          
Share-based Payment Arrangement, Expense $ 21,000 $ 21,000 $ 64,000 $ 81,000  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period         5 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         3 years