Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Note 1 - Summary of Significant Accounting Policies (Details Textual)
 3 Months Ended 6 Months Ended
Sep. 27, 2020
USD ($)
Sep. 29, 2019
USD ($)
Sep. 27, 2020
USD ($)
Sep. 29, 2019
USD ($)
Mar. 29, 2020
USD ($)
Accounts Receivable, after Allowance for Credit Loss, Current, Total $ 18,800,000   $ 18,800,000   $ 17,800,000
Accounts Receivable, Allowance for Credit Loss, Current 684,000   684,000   530,000
Other Accrued Liabilities, Current 465,000   $ 465,000   352,000
Number of Operating Segments     1    
Cost of Goods and Services Sold, Total 14,565,000 $ 12,691,000 $ 25,747,000 $ 24,082,000  
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions 20,000 31,000 33,000 42,000  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total 14,000 18,000 31,000 29,000  
Tax Adjustments, Settlements, and Unusual Provisions       (232,000)  
Interest Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability       (78,000)  
Income Tax Expense (Benefit), Reserve for Unrecognized Tax Benefits, Net Discrete Charge 4,000 4,000 $ 4,000 6,000  
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 1,600,000 1,300,000 $ 2,800,000 2,200,000  
Other Accrued Liabilities [Member]          
Other Accrued Liabilities, Current 465,000   465,000    
Other Accrued Liabilities [Member] | Up-front Payment Arrangement [Member]          
Deferred Revenue, Current, Total 359,000   359,000    
Contract with Customer, Liability, Current         155,000
Receivable Due from Factor [Member]          
Accounts Receivable, after Allowance for Credit Loss, Current, Total 17,900,000   17,900,000   $ 17,100,000
Negative Balance Outstanding Under Revolving Line of Credit [Member]          
Accounts Receivable, after Allowance for Credit Loss, Current, Total 6,800,000   6,800,000    
Receivable from Factor, and Negative Balance on Revolving Line of Credit [Member]          
Accounts Receivable, after Allowance for Credit Loss, Current, Total 24,700,000   24,700,000    
Selling, General and Administrative Expenses [Member]          
Advertising Expense $ 314,000 $ 260,000 $ 659,000 $ 544,000