Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
Income Statement [Abstract]
Net sales	$ 3,103	$ 2,420	$ 5,601	$ 4,977
Cost of sales	1,978	1,958	3,620	4,324
Gross profit	1,125	462	1,981	653
Selling, general and administrative expenses	526	779	1,012	1,223
Operating income (loss)	599	(317)	969	(570)
Other income (loss):
Interest income	0	1	0	1
Dividend income	1	0	7	1
Realized gain (loss) on investments	11	(4)	26	(20)
Unrealized gain (loss) on investments	24	0	2	19
Total other income (loss)	36	(3)	35	1
Net income (loss)	$ 635	$ (320)	$ 1,004	$ (569)
Net income (loss) per common share - basic and diluted	$ 0.31	$ (0.16)	$ 0.49	$ (0.29)
Weighted average common shares outstanding - basic and diluted	2,060,457	2,013,959	2,061,703	1,957,959