CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
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
Balance at Feb. 28, 2022	$ 2,540,400	12,246,600	44,525,100	$ (12,546,600)	46,765,500
Balance (in Shares) at Feb. 28, 2022	12,702,080			3,994,833
Sales of treasury stock		39,000		$ 24,400	63,400
Sales of treasury stock (in Shares)				(7,771)
Forfeiture of restricted share awards		95,700		$ (95,700)
Forfeiture of restricted share awards (in Shares)				16,180
Share-based compensation expense (see Note 6)		261,600			261,600
Net earnings			215,800		215,800
Balance at May. 31, 2022	$ 2,540,400	$ 12,642,900	$ 44,740,900	$ (12,617,900)	$ 47,306,300
Balance (in Shares) at May. 31, 2022	12,702,080			4,003,242