Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Stock-based Compensation - Compensation Expense Associated with Non-vested Stock Grants (Details)

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Note 7 - Stock-based Compensation - Compensation Expense Associated with Non-vested Stock Grants (Details) - USD ($)
3 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Allocated share-based compensation $ 86,000 $ 65,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member]    
Allocated share-based compensation 71,000 56,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2018 [Member]    
Allocated share-based compensation 19,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2019 [Member]    
Allocated share-based compensation 37,000 37,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2020 [Member]    
Allocated share-based compensation 30,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2021 [Member]    
Allocated share-based compensation 4,000
Selling, General and Administrative Expenses [Member] | Employee [Member] | Non-vested Stock Grants [Member]    
Allocated share-based compensation 22,000 18,000
Selling, General and Administrative Expenses [Member] | Employee [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2018 [Member]    
Allocated share-based compensation
Selling, General and Administrative Expenses [Member] | Employee [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2019 [Member]    
Allocated share-based compensation 18,000 18,000
Selling, General and Administrative Expenses [Member] | Employee [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2020 [Member]    
Allocated share-based compensation
Selling, General and Administrative Expenses [Member] | Employee [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2021 [Member]    
Allocated share-based compensation 4,000
Selling, General and Administrative Expenses [Member] | Non Employee Directors [Member] | Non-vested Stock Grants [Member]    
Allocated share-based compensation 49,000 38,000
Selling, General and Administrative Expenses [Member] | Non Employee Directors [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2018 [Member]    
Allocated share-based compensation 19,000
Selling, General and Administrative Expenses [Member] | Non Employee Directors [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2019 [Member]    
Allocated share-based compensation 19,000 19,000
Selling, General and Administrative Expenses [Member] | Non Employee Directors [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2020 [Member]    
Allocated share-based compensation 30,000
Selling, General and Administrative Expenses [Member] | Non Employee Directors [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2021 [Member]    
Allocated share-based compensation