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Income Taxes, Components of Deferred Income Taxes (Details) - USD ($)
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Assets [Abstract]    
Allowance for bad debts $ 78,000 $ 99,000
Customer allowances earned 4,760,000 5,321,000
Allowance for stock adjustment returns 2,391,000 1,651,000
Inventory adjustments 7,817,000 3,815,000
Intangibles, net 809,000 785,000
Stock options 2,770,000 2,984,000
Operating lease liabilities 23,408,000 23,894,000
Estimate for returns 26,670,000 25,445,000
Accrued compensation 2,718,000 3,515,000
Net operating losses 5,351,000 4,617,000
Tax credits 2,012,000 2,018,000
Other 5,046,000 3,833,000
Total deferred tax assets 83,830,000 77,977,000
Liabilities [Abstract]    
Plant and equipment, net (79,000) (1,051,000)
Contract assets (12,357,000) (13,873,000)
Operating lease assets (25,004,000) (23,421,000)
Other (6,864,000) (5,960,000)
Total deferred tax liabilities (44,304,000) (44,305,000)
Less valuation allowance (7,619,000) (6,816,000)
Total 31,907,000 $ 26,856,000
Operating Loss Carryforwards and Tax Credit Carryforward [Abstract]    
Tax credits carryforward $ 2,012,000  
Tax credits carryforward, expiration date Mar. 31, 2034  
Net increase in valuation allowance $ 803,000  
Federal [Member]    
Operating Loss Carryforwards and Tax Credit Carryforward [Abstract]    
Operating loss carryforwards $ 1,361,000  
Operating loss carryforwards, expiration date Mar. 31, 2033  
State [Member]    
Operating Loss Carryforwards and Tax Credit Carryforward [Abstract]    
Operating loss carryforwards $ 649,000  
Operating loss carryforwards, expiration date Mar. 31, 2033  
Foreign [Member]    
Operating Loss Carryforwards and Tax Credit Carryforward [Abstract]    
Operating loss carryforwards $ 19,012,000  
Operating loss carryforwards, expiration date Mar. 31, 2038