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Note M - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 24, 2018
Mar. 31, 2019
Share-based Payment Arrangement, Expense $ 28,000 $ 81,000  
Share Based Compensation Total Unamortized Compensation Expense $ 256,000    
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 $ 38,000  
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