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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, 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       $ (302,500) (302,500)
Purchases of treasury stock (in Shares)       36,959  
Sales of treasury stock   68,100   $ 54,300 122,400
Sales of treasury stock (in Shares)       (19,171)  
Dividends declared     (408,900)   (408,900)
Share-based compensation expense   166,300     166,300
Net earnings     1,363,600   1,363,600
Balance at May. 31, 2019 $ 2,418,400 9,209,500 26,709,600 $ (11,466,100) 26,871,400
Balance (in Shares) at May. 31, 2019 12,092,080     3,914,786  
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  
Net earnings         5,107,000
Balance at Nov. 30, 2019 $ 2,480,000 9,603,400 29,607,200 $ (12,279,300) 29,411,300
Balance (in Shares) at Nov. 30, 2019 12,400,080     4,012,064  
Balance at May. 31, 2019 $ 2,418,400 9,209,500 26,709,600 $ (11,466,100) 26,871,400
Balance (in Shares) at May. 31, 2019 12,092,080     3,914,786  
Purchases of treasury stock       $ (417,100) (417,100)
Purchases of treasury stock (in Shares)       60,357  
Sales of treasury stock   54,000   $ 54,600 108,600
Sales of treasury stock (in Shares)       (22,961)  
Dividends declared     (422,300)   (422,300)
Share-based compensation expense   166,200     166,200
Issuance of restricted share awards for vesting $ 61,600 (61,600)      
Issuance of restricted share awards for vesting (in Shares) 308,000        
Net earnings     1,007,600   1,007,600
Balance at Aug. 31, 2019 $ 2,480,000 9,368,100 27,294,900 $ (11,828,600) 27,314,400
Balance (in Shares) at Aug. 31, 2019 12,400,080     3,952,182  
Purchases of treasury stock       $ (534,100) (534,100)
Purchases of treasury stock (in Shares)       84,841  
Sales of treasury stock   69,000   $ 83,400 152,400
Sales of treasury stock (in Shares)       (24,959)  
Dividends declared     (423,500)   (423,500)
Share-based compensation expense   166,300     166,300
Net earnings     2,735,800   2,735,800
Balance at Nov. 30, 2019 $ 2,480,000 9,603,400 29,607,200 $ (12,279,300) 29,411,300
Balance (in Shares) at Nov. 30, 2019 12,400,080     4,012,064  
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   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. 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  
Net earnings         10,455,700
Balance at Nov. 30, 2020 $ 2,482,000 10,552,600 38,349,900 $ (12,663,200) 38,721,300
Balance (in Shares) at Nov. 30, 2020 12,410,080     4,054,108  
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  
Sales of treasury stock   11,500   $ 7,600 19,100
Sales of treasury stock (in Shares)       (2,438)  
Dividends declared     (500,300)   (500,300)
Share-based compensation expense   216,200     216,200
Net earnings     4,255,000   4,255,000
Balance at Aug. 31, 2020 $ 2,482,000 10,245,600 34,915,800 $ (12,667,200) 34,976,200
Balance (in Shares) at Aug. 31, 2020 12,410,080     4,055,389  
Sales of treasury stock   15,200   $ 4,000 19,200
Sales of treasury stock (in Shares)       (1,281)  
Dividends declared     (835,500)   (835,500)
Share-based compensation expense   291,800     291,800
Net earnings     4,269,600   4,269,600
Balance at Nov. 30, 2020 $ 2,482,000 $ 10,552,600 $ 38,349,900 $ (12,663,200) $ 38,721,300
Balance (in Shares) at Nov. 30, 2020 12,410,080     4,054,108