Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Stock-based Compensation - Stock Option Compensation (Details)

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Note 6 - Stock-based Compensation - Stock Option Compensation (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Dec. 30, 2018
Dec. 31, 2017
Allocated share-based compensation $ 84,000 $ 129,000 $ 281,000 $ 406,000
Employee Stock Option [Member]        
Allocated share-based compensation 16,000 19,000 57,000 62,000
Employee Stock Option [Member] | Cost of Sales [Member]        
Allocated share-based compensation 6,000 9,000 25,000 37,000
Employee Stock Option [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation 10,000 10,000 32,000 25,000
Employee Stock Option [Member] | Fiscal Year 2017 [Member]        
Allocated share-based compensation   8,000 11,000 31,000
Employee Stock Option [Member] | Fiscal Year 2017 [Member] | Cost of Sales [Member]        
Allocated share-based compensation   4,000 6,000 20,000
Employee Stock Option [Member] | Fiscal Year 2017 [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation   4,000 5,000 11,000
Employee Stock Option [Member] | Fiscal Year 2016 [Member]        
Allocated share-based compensation       7,000
Employee Stock Option [Member] | Fiscal Year 2016 [Member] | Cost of Sales [Member]        
Allocated share-based compensation       6,000
Employee Stock Option [Member] | Fiscal Year 2016 [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation       1,000
Employee Stock Option [Member] | Fiscal Year 2018 [Member]        
Allocated share-based compensation 10,000 11,000 33,000 24,000
Employee Stock Option [Member] | Fiscal Year 2018 [Member] | Cost of Sales [Member]        
Allocated share-based compensation 4,000 5,000 14,000 11,000
Employee Stock Option [Member] | Fiscal Year 2018 [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation 6,000 $ 6,000 19,000 $ 13,000
Employee Stock Option [Member] | Fiscal Year 2019 [Member]        
Allocated share-based compensation 6,000   13,000  
Employee Stock Option [Member] | Fiscal Year 2019 [Member] | Cost of Sales [Member]        
Allocated share-based compensation 2,000   5,000  
Employee Stock Option [Member] | Fiscal Year 2019 [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation $ 4,000   $ 8,000