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 6 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Sep. 29, 2019
Sep. 30, 2018
Allocated share-based compensation $ 75,000 $ 87,000 $ 140,000 $ 197,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member]        
Allocated share-based compensation 64,000 73,000 120,000 156,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2017 [Member]        
Allocated share-based compensation 12,000 47,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2018 [Member]        
Allocated share-based compensation 7,000 49,000 26,000 97,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2019 [Member]        
Allocated share-based compensation 37,000 12,000 74,000 12,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2020 [Member]        
Allocated share-based compensation 20,000 20,000
Selling, General and Administrative Expenses [Member] | Employee [Member] | Non-vested Stock Grants [Member]        
Allocated share-based compensation 18,000 29,000 36,000 58,000
Selling, General and Administrative Expenses [Member] | Employee [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2017 [Member]        
Allocated share-based compensation
Selling, General and Administrative Expenses [Member] | Employee [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2018 [Member]        
Allocated share-based compensation 29,000 58,000
Selling, General and Administrative Expenses [Member] | Employee [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2019 [Member]        
Allocated share-based compensation 18,000 36,000
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] | Non Employee Directors [Member] | Non-vested Stock Grants [Member]        
Allocated share-based compensation 46,000 44,000 84,000 98,000
Selling, General and Administrative Expenses [Member] | Non Employee Directors [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2017 [Member]        
Allocated share-based compensation 12,000 47,000
Selling, General and Administrative Expenses [Member] | Non Employee Directors [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2018 [Member]        
Allocated share-based compensation 7,000 20,000 26,000 39,000
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 12,000 38,000 12,000
Selling, General and Administrative Expenses [Member] | Non Employee Directors [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2020 [Member]        
Allocated share-based compensation $ 20,000 $ 20,000