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Accounts Receivable - Net (Details) - USD ($)
 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Mar. 31, 2022
Components of accounts receivable [Abstract]      
Accounts receivable - trade $ 101,989,000   $ 98,734,000
Allowance for credit losses (242,000)   (375,000)
Customer payment discrepancies (1,604,000)   (1,375,000)
Customer returns RGA issued (20,282,000)   (11,909,000)
Total accounts receivable - net 79,861,000   $ 85,075,000
Allowance for credit losses [Roll Forward]      
Balance at beginning of period 375,000 $ 348,000  
Provision for expected credit losses 11,000 17,000  
Recoveries 0 0  
Amounts written off charged against the allowance (144,000) (39,000)  
Balance at end of period $ 242,000 $ 326,000