CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance at Feb. 29, 2020	$ 2,482,000	$ 9,843,900	$ 29,732,200	$ (12,665,300)	$ 29,392,800
Balance (in Shares) at Feb. 29, 2020	12,410,080			4,061,429
Purchases of treasury stock				$ (75,500)	(75,500)
Purchases of treasury stock (in Shares)				17,565
Sales of treasury stock		5,000		$ 66,000	71,000
Sales of treasury stock (in Shares)				(21,167)
Dividends declared			(502,200)		(502,200)
Share-based compensation expense (see Note 6)		169,000			169,000
Net earnings			1,931,100		1,931,100
Balance at May. 31, 2020	$ 2,482,000	10,017,900	31,161,100	$ (12,674,800)	30,986,200
Balance (in Shares) at May. 31, 2020	12,410,080			4,057,827
Balance at Feb. 28, 2021	$ 2,482,000	10,863,900	39,683,000	$ (12,769,100)	40,259,800
Balance (in Shares) at Feb. 28, 2021	12,410,080			4,063,480
Sales of treasury stock		26,600		$ 5,400	32,000
Sales of treasury stock (in Shares)				(1,714)
Dividends declared			(834,800)		(834,800)
Share-based compensation expense (see Note 6)		261,600			261,600
Net earnings			3,438,100		3,438,100
Balance at May. 31, 2021	$ 2,482,000	$ 11,152,100	$ 42,286,300	$ (12,763,700)	$ 43,156,700
Balance (in Shares) at May. 31, 2021	12,410,080			4,061,766