Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Stock-based Compensation - Grants and Compensation Expense in Connection With the Performance Bonus Plan (Details)

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Note 7 - Stock-based Compensation - Grants and Compensation Expense in Connection With the Performance Bonus Plan (Details) - USD ($)
6 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Performance Bonus Plan [Member]    
Shares Vested (in shares) 21,125 41,726
Shares Vested, Aggregate Value $ 109,000 $ 246,000
Shares Vested, Taxes Remitted $ 17,000 $ 95,000
Performance Shares [Member]    
Number of Shares (in shares) 0  
Performance Shares [Member] | Earned in Fiscal Year 2016, Granted in Fiscal Year 2017 [Member] | Performance Bonus Plan [Member]    
Number of Shares (in shares) 41,205  
Shares Vested (in shares) 20,601
Shares Vested, Aggregate Value $ 122,000
Shares Vested, Taxes Remitted $ 39,000
Performance Shares [Member] | Earned in Fiscal Year 2017, Granted in Fiscal Year 2018 [Member] | Performance Bonus Plan [Member]    
Number of Shares (in shares) 42,250  
Shares Vested (in shares) 21,125 21,125
Shares Vested, Aggregate Value $ 109,000 $ 124,000
Shares Vested, Taxes Remitted $ 17,000 $ 56,000