Annual report pursuant to Section 13 and 15(d)

Note 2 - Summary of Significant Accounting Policies (Details Textual)

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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
 12 Months Ended
Mar. 15, 2023
Mar. 31, 2024
Apr. 02, 2023
May 30, 2023
Aug. 31, 2020
Accounts Receivable, after Allowance for Credit Loss, Current   $ 22,400,000 $ 22,800,000    
Accounts Receivable, Allowance for Credit Loss, Current   1,500,000 1,500,000    
Cost of Goods and Services Sold   64,632,000 55,225,000    
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions   43,000 73,000    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense   28,000 45,000    
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority       $ (442,000) $ (442,000)
Income Tax Examination, Discrete Income Tax Benefit, Net of Federal Income Tax     81,000    
Income Tax Examination, Increase (Decrease) in Interest Expense     (86,000)    
Income Tax Examination, Refund Claim, Disallowed $ 81,000   81,000    
Advertising Expense   572,000 422,000    
Royalty [Member]          
Cost of Goods and Services Sold   $ 5,300,000 5,200,000    
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      
Receivable Due from Factor [Member]          
Accounts Receivable, after Allowance for Credit Loss, Current   $ 18,600,000 $ 20,700,000