Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	May 31, 2020	May 31, 2019
Income Statement [Abstract]
Net sales	$ 2,498	$ 2,557
Cost of sales	1,642	2,366
Gross profit	856	191
Selling, general and administrative expenses	486	444
Operating income (loss)	370	(253)
Other income (loss):
Dividend income	6	1
Realized gain (loss) on investments	15	(16)
Unrealized gain (loss) on investments	(22)	19
Total other income (loss)	(1)	4
Net income (loss)	$ 369	$ (249)
Net income (loss) per common share - basic and diluted	$ 0.18	$ (0.13)
Weighted average common shares outstanding - basic and diluted	2,062,949	1,901,959