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 9 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Dec. 27, 2020
Dec. 29, 2019
Allocated share-based compensation $ 103,000 $ 79,000 $ 289,000 $ 219,000
Non-vested Stock Grants [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation 91,000 68,000 249,000 188,000
Non-vested Stock Grants [Member] | Selling, General and Administrative Expenses [Member] | Fiscal Year 2019 [Member]        
Allocated share-based compensation 18,000 38,000 80,000 112,000
Non-vested Stock Grants [Member] | Selling, General and Administrative Expenses [Member] | Fiscal Year 2018 [Member]        
Allocated share-based compensation     26,000
Non-vested Stock Grants [Member] | Selling, General and Administrative Expenses [Member] | Fiscal Year 2020 [Member]        
Allocated share-based compensation 30,000 30,000 90,000 50,000
Non-vested Stock Grants [Member] | Selling, General and Administrative Expenses [Member] | Fiscal Year 2021 [Member]        
Allocated share-based compensation 43,000 79,000
Non-vested Stock Grants [Member] | Employee [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation 31,000 19,000 84,000 55,000
Non-vested Stock Grants [Member] | Employee [Member] | Selling, General and Administrative Expenses [Member] | Fiscal Year 2019 [Member]        
Allocated share-based compensation 18,000 19,000 55,000 55,000
Non-vested Stock Grants [Member] | Employee [Member] | Selling, General and Administrative Expenses [Member] | Fiscal Year 2018 [Member]        
Allocated share-based compensation    
Non-vested Stock Grants [Member] | Employee [Member] | Selling, General and Administrative Expenses [Member] | Fiscal Year 2020 [Member]        
Allocated share-based compensation
Non-vested Stock Grants [Member] | Employee [Member] | Selling, General and Administrative Expenses [Member] | Fiscal Year 2021 [Member]        
Allocated share-based compensation 13,000 29,000
Non-vested Stock Grants [Member] | Non Employee Directors [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation 60,000 49,000 165,000 133,000
Non-vested Stock Grants [Member] | Non Employee Directors [Member] | Selling, General and Administrative Expenses [Member] | Fiscal Year 2019 [Member]        
Allocated share-based compensation 19,000 25,000 57,000
Non-vested Stock Grants [Member] | Non Employee Directors [Member] | Selling, General and Administrative Expenses [Member] | Fiscal Year 2018 [Member]        
Allocated share-based compensation     26,000
Non-vested Stock Grants [Member] | Non Employee Directors [Member] | Selling, General and Administrative Expenses [Member] | Fiscal Year 2020 [Member]        
Allocated share-based compensation 30,000 30,000 90,000 50,000
Non-vested Stock Grants [Member] | Non Employee Directors [Member] | Selling, General and Administrative Expenses [Member] | Fiscal Year 2021 [Member]        
Allocated share-based compensation $ 30,000 $ 50,000