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Income Taxes, Components of Deferred Income Taxes (Details) - USD ($)
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Assets [Abstract]    
Allowance for bad debts $ 1,037,000 $ 1,005,000
Customer allowances earned 3,549,000 3,177,000
Allowance for stock adjustment returns 1,743,000 2,073,000
Inventory adjustments 5,567,000 3,701,000
Stock options 2,427,000 2,221,000
Operating lease liabilities 19,396,000 [1] 0
Estimate for returns 10,839,000 2,107,000
Accrued compensation 1,964,000 1,578,000
Net operating losses 4,091,000 2,088,000
Tax credits 1,343,000 1,495,000
Other 1,620,000 5,776,000
Total deferred tax assets 53,576,000 25,221,000
Liabilities [Abstract]    
Plant and equipment, net (5,175,000) (3,316,000)
Intangibles, net (4,700,000) (5,390,000)
Operating lease (15,371,000) [1] 0
Other (3,966,000) (3,278,000)
Total deferred tax liabilities (29,212,000) (11,984,000)
Less valuation allowance (5,493,000) (3,748,000)
Total 18,871,000 $ 9,489,000
Operating Loss Carryforwards and Tax Credit Carryforward [Abstract]    
Tax credits carryforward $ 1,343,000  
Tax credits carryforward, expiration date Mar. 31, 2032  
State [Member]    
Operating Loss Carryforwards and Tax Credit Carryforward [Abstract]    
Operating loss carryforwards $ 1,689,000  
Operating loss carryforwards, expiration date Mar. 31, 2034  
Foreign [Member]    
Operating Loss Carryforwards and Tax Credit Carryforward [Abstract]    
Operating loss carryforwards $ 14,953,000  
Operating loss carryforwards, expiration date Mar. 31, 2038  
[1] Adoption of the new lease standard as of April 1, 2019 (see Note 2) resulted in the recognition of a deferred tax asset for operating lease liabilities and a deferred tax liability for operating lease assets. These temporary differences will reverse over the estimated term of the relevant operating leases. As of March 31, 2019, the deferred tax assets associated with operating leases were reported as other deferred tax assets under legacy US GAAP.