Quarterly report pursuant to Section 13 or 15(d)

Note 1 - Summary of Significant Accounting Policies (Details Textual)

v3.20.4
Note 1 - Summary of Significant Accounting Policies (Details Textual)
 3 Months Ended 9 Months Ended
Dec. 27, 2020
USD ($)
Dec. 29, 2019
USD ($)
Dec. 27, 2020
USD ($)
Dec. 29, 2019
USD ($)
Mar. 29, 2020
USD ($)
Accounts Receivable, after Allowance for Credit Loss, Current, Total $ 18,200,000   $ 18,200,000   $ 17,800,000
Accounts Receivable, Allowance for Credit Loss, Current 791,000   791,000   530,000
Other Accrued Liabilities, Current 347,000   $ 347,000   352,000
Number of Operating Segments     1    
Cost of Goods and Services Sold, Total 13,323,000 $ 12,766,000 $ 39,070,000 $ 36,848,000  
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions 25,000 29,000 58,000 71,000  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total 15,000 18,000 46,000 62,000  
Income Tax Expense (Benefit), Reserve for Unrecognized Tax Benefits, Net Discrete Charge       (232,000)  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Reversed       78,000  
Income Tax Expense (Benefit), Discrete Effect From Tax Credits (74,000) (274,000) (74,000) (274,000)  
Discrete Income Tax Charge, Shortfall from Vesting of Non-vested Stock (16,000) (1,000) $ (12,000) 5,000  
Minimum [Member]          
Property, Plant and Equipment, Useful Life (Year)     3 years    
Finite-Lived Intangible Asset, Useful Life (Year)     5 years    
Maximum [Member]          
Property, Plant and Equipment, Useful Life (Year)     8 years    
Finite-Lived Intangible Asset, Useful Life (Year)     20 years    
Royalty [Member]          
Cost of Goods and Services Sold, Total 1,400,000 1,300,000 $ 4,200,000 3,500,000  
Other Accrued Liabilities [Member] | Up-front Payment Arrangement [Member]          
Other Accrued Liabilities, Current 256,000   256,000    
Contract with Customer, Liability, Current         155,000
Receivable Due from Factor [Member]          
Accounts Receivable, after Allowance for Credit Loss, Current, Total 16,900,000   16,900,000   $ 17,100,000
Negative Balance Outstanding Under Revolving Line of Credit [Member]          
Accounts Receivable, after Allowance for Credit Loss, Current, Total 3,200,000   3,200,000    
Receivable from Factor, and Negative Balance on Revolving Line of Credit [Member]          
Accounts Receivable, after Allowance for Credit Loss, Current, Total 20,100,000   20,100,000    
Selling, General and Administrative Expenses [Member]          
Advertising Expense $ 283,000 $ 261,000 $ 942,000 $ 805,000