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 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
Employee Stock Option [Member]        
Allocated share-based compensation 21,000 23,000 43,000 65,000
Employee Stock Option [Member] | Cost of Sales [Member]        
Allocated share-based compensation 10,000 13,000 28,000 36,000
Employee Stock Option [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation 11,000 10,000 15,000 29,000
Employee Stock Option [Member] | Fiscal Year 2016 [Member]        
Allocated share-based compensation 9,000 7,000 22,000
Employee Stock Option [Member] | Fiscal Year 2016 [Member] | Cost of Sales [Member]        
Allocated share-based compensation 5,000 6,000 12,000
Employee Stock Option [Member] | Fiscal Year 2016 [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation 4,000 1,000 10,000
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 11,000 14,000 23,000 17,000
Employee Stock Option [Member] | Fiscal Year 2017 [Member] | Cost of Sales [Member]        
Allocated share-based compensation 6,000 8,000 16,000 10,000
Employee Stock Option [Member] | Fiscal Year 2017 [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation 5,000 6,000 7,000 7,000
Employee Stock Option [Member] | Fiscal Year 2018 [Member]        
Allocated share-based compensation 10,000 13,000
Employee Stock Option [Member] | Fiscal Year 2018 [Member] | Cost of Sales [Member]        
Allocated share-based compensation 4,000 6,000
Employee Stock Option [Member] | Fiscal Year 2018 [Member] | Selling, General and Administrative Expenses [Member]        
Allocated share-based compensation $ 6,000 $ 7,000