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Note M - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 29, 2019
Sep. 23, 2018
Sep. 29, 2019
Sep. 23, 2018
Mar. 31, 2019
Share-based Payment Arrangement, Expense $ 30,000 $ 23,000 $ 58,000 $ 104,000  
Share Based Compensation Total Unamortized Compensation Expense 226,000   $ 226,000    
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 $ 22,000 $ 22,000 $ 43,000 $ 60,000  
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