STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance at Feb. 28, 2019	$ 2,418,400	$ 8,975,100	$ 25,754,900	$ (11,217,900)	$ 25,930,500
Balance (in Shares) at Feb. 28, 2019	12,092,080			3,896,998
Purchases of treasury stock				$ (1,705,800)	$ (1,705,800)
Purchases of treasury stock (in Shares)				254,475	254,475
Sales of treasury stock		241,000		$ 258,400	$ 499,400
Sales of treasury stock (in Shares)				(90,044)
Exercise of stock options	$ 2,000	24,300			$ 26,300
Exercise of stock options (in Shares)	10,000				10,000
Dividends declared			(1,667,800)		$ (1,667,800)
Share-based compensation expense (see Note 10)		665,100			665,100
Issuance of restricted share awards for vesting	$ 61,600	(61,600)
Issuance of restricted share awards for vesting (in Shares)	308,000
Net earnings			5,645,100		5,645,100
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				$ (163,800)	$ (163,800)
Purchases of treasury stock (in Shares)				22,565	22,565
Sales of treasury stock		57,800		$ 83,600	$ 141,400
Sales of treasury stock (in Shares)				(26,828)
Exercise of stock options (in Shares)					0
Dividends declared			(2,673,200)		$ (2,673,200)
Forfeiture of restricted share awards		23,600		$ (23,600)
Forfeiture of restricted share awards (in Shares)				6,314
Share-based compensation expense (see Note 10)		938,600			938,600
Net earnings			12,624,000		12,624,000
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