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Consolidated Condensed Statement of Changes in Stockholders' Equity - USD ($)
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock
Beginning Balance (in shares) at Jun. 30, 2018   33,080,543      
Beginning Balance at Jun. 30, 2018 $ 77,289,479 $ 33,080 $ 41,757,645 $ 35,498,754 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of restricted common stock (in shares)   86,396      
Issuance of restricted common stock   $ 86 (86)    
Common share repurchases, including shares surrendered for tax withholding (in shares)   0      
Common share repurchases, including shares surrendered for tax withholding (89,992)       (89,992)
Retirements of treasury stock (in shares)   (9,087)      
Retirements of treasury stock   $ (9) (89,983)   89,992
Stock-based compensation 215,373   215,373    
Net income 5,795,801     5,795,801  
Common stock cash dividends (3,315,785)     (3,315,785)  
Ending Balance (in shares) at Sep. 30, 2018   33,157,852      
Ending Balance at Sep. 30, 2018 $ 79,894,876 $ 33,157 41,882,949 37,978,770 0
Beginning Balance (in shares) at Jun. 30, 2019 33,183,730 33,183,730      
Beginning Balance at Jun. 30, 2019 $ 80,125,858 $ 33,183 42,488,913 37,603,762 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of restricted common stock (in shares)   59,028      
Issuance of restricted common stock   $ 59 (59)    
Forfeitures of restricted stock (in shares)   (8,248)      
Forfeitures of restricted stock   $ (8) 8    
Common share repurchases, including shares surrendered for tax withholding (in shares)   0      
Common share repurchases, including shares surrendered for tax withholding (1,362,424)       (1,362,424)
Retirements of treasury stock (in shares)   (231,376)      
Retirements of treasury stock   $ (231) (1,362,193)   1,362,424
Stock-based compensation 332,013   332,013    
Net income 2,792,820     2,792,820  
Common stock cash dividends $ (3,306,408)     (3,306,408)  
Ending Balance (in shares) at Sep. 30, 2019 33,003,134 33,003,134      
Ending Balance at Sep. 30, 2019 $ 78,581,859 $ 33,003 $ 41,458,682 $ 37,090,174 $ 0