Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Stock-based Compensation - Compensation Expense Associated with Non-vested Stock Grants (Details)

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Note 6 - Stock-based Compensation - Compensation Expense Associated with Non-vested Stock Grants (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Oct. 01, 2017
Oct. 02, 2016
Allocated share-based compensation $ 135,000 $ 146,000 $ 277,000 $ 307,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member]        
Allocated share-based compensation 114,000 123,000 234,000 242,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Employee [Member]        
Allocated share-based compensation 56,000 62,000 112,000 124,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Non Employee Directors [Member]        
Allocated share-based compensation 58,000 61,000 122,000 118,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2015 [Member]        
Allocated share-based compensation 9,000 37,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2015 [Member] | Employee [Member]        
Allocated share-based compensation
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2015 [Member] | Non Employee Directors [Member]        
Allocated share-based compensation 9,000 37,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2016 [Member]        
Allocated share-based compensation 9,000 63,000 38,000 127,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2016 [Member] | Employee [Member]        
Allocated share-based compensation 35,000 70,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2016 [Member] | Non Employee Directors [Member]        
Allocated share-based compensation 9,000 28,000 38,000 57,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2017 [Member]        
Allocated share-based compensation 63,000 51,000 125,000 78,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2017 [Member] | Employee [Member]        
Allocated share-based compensation 27,000 27,000 54,000 54,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2017 [Member] | Non Employee Directors [Member]        
Allocated share-based compensation 36,000 24,000 71,000 24,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2018 [Member]        
Allocated share-based compensation 42,000 71,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2018 [Member] | Employee [Member]        
Allocated share-based compensation 29,000 58,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2018 [Member] | Non Employee Directors [Member]        
Allocated share-based compensation $ 13,000 $ 13,000