Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Income Statement [Abstract]
Net sales	$ 2,312	$ 2,263	$ 7,913	$ 7,240
Cost of sales	1,799	1,802	5,419	6,126
Gross profit	513	461	2,494	1,114
Selling, general and administrative expenses	575	422	1,587	1,645
Operating income (loss)	(62)	39	907	(531)
Other income (loss):
Interest income	0	1	0	2
Dividend income	0	0	7	1
Realized gain (loss) on investments	9	(2)	35	(22)
Unrealized gain (loss) on investments	26	0	28	19
Total other income (loss)	35	(1)	70	0
Net income (loss)	$ (27)	$ 38	$ 977	$ (531)
Net income (loss) per common share - basic and diluted	$ (0.01)	$ 0.02	$ 0.47	$ (0.27)
Weighted average common shares outstanding - basic and diluted	2,064,754	2,062,952	2,062,713	1,992,702