Income Taxes, Components of Deferred Income Taxes (Details) - USD ($)	Mar. 31, 2024	Mar. 31, 2023
Assets [Abstract]
Allowance for bad debts	$ 44,000	$ 78,000
Customer allowances earned	4,706,000	4,760,000
Allowance for stock adjustment returns	3,620,000	2,391,000
Inventory adjustments	7,419,000	7,817,000
Intangibles, net	852,000	809,000
Stock options	2,723,000	2,770,000
Operating lease liabilities	21,251,000	23,408,000
Estimate for returns	29,942,000	26,670,000
Accrued compensation	2,600,000	2,718,000
Net operating losses	4,670,000	5,351,000
Tax credits	2,054,000	2,012,000
Capitalized research credits	1,158,000	0
Plant and equipment, net	1,010,000	0
Other	6,588,000	5,046,000
Total deferred tax assets	88,637,000	83,830,000
Liabilities [Abstract]
Plant and equipment, net	0	(79,000)
Contract assets	(10,265,000)	(12,357,000)
Operating lease assets	(23,845,000)	(25,004,000)
Other	(6,663,000)	(6,864,000)
Total deferred tax liabilities	(40,773,000)	(44,304,000)
Less valuation allowance	(45,399,000)	(7,619,000)
Total	$ 2,465,000	$ 31,907,000