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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, 2018 $ 2,418,400 $ 8,573,300 $ 20,714,500 $ (11,304,100) $ 20,402,100
Balance (in Shares) at Feb. 28, 2018 12,092,080     3,912,468  
Purchases of treasury stock       $ (29,600) (29,600)
Purchases of treasury stock (in Shares)       2,846  
Sales of treasury stock       $ 25,100 25,100
Sales of treasury stock (in Shares)       (3,302)  
Dividends declared     (409,000)   (409,000)
Net earnings     1,816,600   1,816,600
Balance at May. 31, 2018 $ 2,418,400 8,573,300 22,122,100 $ (11,308,600) 21,805,200
Balance (in Shares) at May. 31, 2018 12,092,080     3,912,012  
Balance at Feb. 28, 2018 $ 2,418,400 8,573,300 20,714,500 $ (11,304,100) 20,402,100
Balance (in Shares) at Feb. 28, 2018 12,092,080     3,912,468  
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