Statements of Operation and Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2021	Feb. 29, 2020
Income Statement [Abstract]
Net sales	$ 10,534	$ 9,237
Cost of sales	7,257	7,762
Gross profit	3,277	1,475
Selling, general and administrative expenses	2,108	2,104
Operating income (loss)	1,169	(629)
Other income (loss):
Interest income	0	1
Interest expense	(5)	0
Dividend income	7	9
Realized gain (loss) on investments	98	(28)
Unrealized gain (loss) on investments	36	41
Other, net	76	0
Total other income (loss)	212	23
Net loss	$ 1,381	$ (606)
Net loss per common share:
Basic and diluted	$ 0.67	$ (0.30)
Weighted-average common shares outstanding:
Basic and diluted	2,067,829	2,010,168