Accounts Receivable - Net (Details) - USD ($)	9 Months Ended
	Dec. 31, 2020	Mar. 31, 2020
Components of accounts receivable [Abstract]
Accounts receivable - trade	$ 56,568,000	$ 109,164,000
Allowance for credit losses	(328,000)	(4,252,000)
Customer payment discrepancies	(531,000)	(1,040,000)
Customer returns RGA issued	(10,438,000)	(12,124,000)
Total accounts receivable - net	45,271,000	$ 91,748,000
Allowance for credit losses [Roll Forward]
Balance at beginning of period	4,252,000
Provision for expected credit losses	74,000
Recoveries	(100,000)
Amounts written off charged against the allowance	(3,898,000)
Balance at end of period	$ 328,000