Annual report pursuant to Section 13 and 15(d)

Note 12 - Commitments and Contingencies (Details Textual)

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Note 12 - Commitments and Contingencies (Details Textual) - USD ($)
 12 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Operating Leases, Rent Expense, Total $ 1,700,000 $ 1,600,000
Operating Leases, Future Minimum Payments Due, Total 1,900,000  
Operating Leases, Future Minimum Payments Due, Next Twelve Months 1,400,000  
Operating Leases, Future Minimum Payments, Due in Two Years 497,000  
Operating Leases, Future Minimum Payments, Due in Three Years 42,000  
Royalty Expense 5,200,000 $ 7,200,000
Royalty Expense Due 3,200,000  
Royalty Expense Due in Next Twelve Months 2,500,000  
Royalty Expense Due in Two Years 549,000  
Royalty Expense Due in Three Years $ 147,000