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. 31, 2017
Jan. 01, 2017
Dec. 31, 2017
Jan. 01, 2017
Allocated share-based compensation $ 129,000 $ 149,000 $ 406,000 $ 456,000
Employee Stock Option [Member]        
Allocated share-based compensation 19,000 23,000 62,000 88,000
Employee Stock Option [Member] | Cost of Sales [Member]        
Allocated share-based compensation 9,000 13,000 37,000 49,000
Employee Stock Option [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation 10,000 10,000 25,000 39,000
Employee Stock Option [Member] | Fiscal Year 2016 [Member]        
Allocated share-based compensation 10,000 7,000 32,000
Employee Stock Option [Member] | Fiscal Year 2016 [Member] | Cost of Sales [Member]        
Allocated share-based compensation 5,000 6,000 17,000
Employee Stock Option [Member] | Fiscal Year 2016 [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation 5,000 1,000 15,000
Employee Stock Option [Member] | Fiscal Year 2015 [Member]        
Allocated share-based compensation     26,000
Employee Stock Option [Member] | Fiscal Year 2015 [Member] | Cost of Sales [Member]        
Allocated share-based compensation     14,000
Employee Stock Option [Member] | Fiscal Year 2015 [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation     12,000
Employee Stock Option [Member] | Fiscal Year 2017 [Member]        
Allocated share-based compensation 8,000 13,000 31,000 30,000
Employee Stock Option [Member] | Fiscal Year 2017 [Member] | Cost of Sales [Member]        
Allocated share-based compensation 4,000 8,000 20,000 18,000
Employee Stock Option [Member] | Fiscal Year 2017 [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation 4,000 5,000 11,000 12,000
Employee Stock Option [Member] | Fiscal Year 2018 [Member]        
Allocated share-based compensation 11,000 24,000
Employee Stock Option [Member] | Fiscal Year 2018 [Member] | Cost of Sales [Member]        
Allocated share-based compensation 5,000 11,000
Employee Stock Option [Member] | Fiscal Year 2018 [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation $ 6,000 $ 13,000