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 9 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2017
Jan. 01, 2017
Allocated share-based compensation $ 129,000 $ 149,000 $ 406,000 $ 456,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member]        
Allocated share-based compensation 110,000 126,000 344,000 368,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Employee [Member]        
Allocated share-based compensation 56,000 62,000 168,000 186,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Non Employee Directors [Member]        
Allocated share-based compensation 54,000 64,000 176,000 182,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2015 [Member]        
Allocated share-based compensation 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 37,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2016 [Member]        
Allocated share-based compensation 64,000 38,000 191,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2016 [Member] | Employee [Member]        
Allocated share-based compensation 35,000 105,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2016 [Member] | Non Employee Directors [Member]        
Allocated share-based compensation 29,000 38,000 86,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2017 [Member]        
Allocated share-based compensation 62,000 62,000 187,000 140,000
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 81,000 81,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2017 [Member] | Non Employee Directors [Member]        
Allocated share-based compensation 35,000 35,000 106,000 59,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2018 [Member]        
Allocated share-based compensation 48,000 119,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2018 [Member] | Employee [Member]        
Allocated share-based compensation 29,000 87,000
Selling, General and Administrative Expenses [Member] | Non-vested Stock Grants [Member] | Fiscal Year 2018 [Member] | Non Employee Directors [Member]        
Allocated share-based compensation $ 19,000 $ 32,000