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STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Total
Balance at Feb. 28, 2017 $ 2,416,400 $ 8,549,000 $ 15,499,800 $ (11,247,800) $ 15,217,400
Balance (in Shares) at Feb. 28, 2017 12,082,080     3,901,932  
Exercise of stock options $ 2,000 24,300     $ 26,300
Exercise of stock options (in Shares) 10,000       10,000
Purchases of treasury stock       $ (98,400) $ (98,400)
Purchases of treasury stock (in Shares)       20,138  
Sales of treasury stock       $ 42,100 42,100
Sales of treasury stock (in Shares)       (9,602)  
Net earnings     5,214,700   5,214,700
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  
Exercise of stock options (in Shares)         0
Purchases of treasury stock       $ (256,500) $ (256,500)
Purchases of treasury stock (in Shares)       25,171  
Sales of treasury stock       $ 342,700 342,700
Sales of treasury stock (in Shares)       (40,641)  
Dividends paid     (1,227,900)   (1,227,900)
Dividends declared     (410,100)   (410,100)
Share-based compensation expense   401,800     401,800
Net earnings     6,678,400   6,678,400
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