4. Accounts Receivable (Details) - USD ($)	Mar. 31, 2019	Mar. 31, 2018
Receivables [Abstract]
Accounts receivable	$ 3,948,000	$ 2,829,000
Less: allowance for doubtful accounts	(24,000)	(17,000)
Less: discounts, rebates, distributor fees and returns	(443,000)	(1,275,000)
Accounts receivable, net	$ 3,481,000	$ 1,537,000