Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net revenues:
Revenue	$ 2,300	$ 1,859	$ 3,374	$ 3,911
Costs and expenses:
Cost of sales	1,309	1,351	2,188	2,960
Selling, general and administrative expenses	1,291	1,363	2,635	2,738
Costs and Expenses, Total	2,600	2,714	4,823	5,698
Operating loss	(300)	(855)	(1,449)	(1,787)
Other (loss) income:
Interest income, net	139	16	189	33
Income from governmental assistance programs	8	207	30	207
Loss before income taxes	(153)	(632)	(1,230)	(1,547)
Provision for income tax expense	0	0	0	0
Net loss	$ (153)	$ (632)	$ (1,230)	$ (1,547)
Basic loss per share (in dollars per share)	$ (0.01)	$ (0.03)	$ (0.06)	$ (0.07)
Diluted loss per share (in dollars per share)	$ (0.01)	$ (0.03)	$ (0.06)	$ (0.07)
Weighted average shares outstanding
Basic (in shares)	21,043	21,043	21,043	21,043
Diluted (in shares)	21,043	21,043	21,043	21,043
Product [Member]
Net revenues:
Revenue	$ 1,627	$ 1,794	$ 2,631	$ 3,781
License [Member]
Net revenues:
Revenue	$ 673	$ 65	$ 743	$ 130