Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash Flows from Operating Activities:
Net (loss)	$ (1,230)	$ (1,547)
Adjustments to reconcile net loss to net cash (used) by operating activities:
Loan forgiveness from Paycheck Protection Program	0	(207)
Amortization of right-of-use assets	106	113
Asset valuation allowances	(25)	71
Changes in assets and liabilities:
Accounts receivable	248	(865)
Inventory	(447)	(938)
Prepaid purchases	81	(92)
Prepaid expenses and other current assets	(55)	(277)
Accounts payable and other current liabilities	(116)	(54)
Right of use assets-operating	0	(403)
Short term lease liabilities	(44)	68
Long term lease liabilities	(70)	219
Income taxes payable	(205)	(223)
Advanced deposits	4,100	0
Deferred revenue	(97)	(130)
Net cash provided (used) by operating activities	2,197	(4,265)
Cash Flows From Investing Activities:
Proceeds from sale of short-term investments	0	25,045
Purchases of short-term investments	0	0
Net cash provided by investing activities	0	25,045
Net cash provided by financing activities	0	0
Net increase in cash and cash equivalents	2,197	20,780
Cash and cash equivalents at beginning of the year	25,576	5,245
Cash and cash equivalents at end of the year	27,773	26,025
Cash paid for:
Interest	6	4
Income taxes	205	222
License [Member]
Changes in assets and liabilities:
Licensing receivable	$ (49)	$ 0