Accounts Receivable - Net (Details) - USD ($)	Dec. 31, 2019	Mar. 31, 2019
Accounts Receivable - Net [Abstract]
Accounts receivable - trade	$ 66,514,000	$ 75,847,000
Less: total accounts receivable offset accounts [Abstract]
Allowance for bad debts	(4,485,000)	(4,100,000)
Customer payment discrepancies	(1,127,000)	(854,000)
Customer returns RGAs issued	(7,972,000)	(14,878,000)
Total accounts receivable - net	$ 52,930,000	$ 56,015,000