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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)   121,611      
Issuance of restricted common stock   $ 122 (122)    
Common share repurchases, including shares surrendered for tax withholding (in shares)   0      
Common share repurchases, including shares surrendered for tax withholding (138,638)       (138,638)
Retirements of treasury stock (in shares)   (15,489)      
Retirements of treasury stock   $ (16) (138,622)   138,638
Stock-based compensation 469,484   469,484    
Net income 9,700,366     9,700,366  
Common stock cash dividends (6,634,896)     (6,634,896)  
Ending Balance (in shares) at Dec. 31, 2018   33,186,665      
Ending Balance at Dec. 31, 2018 80,685,795 $ 33,186 42,088,385 38,564,224 0
Beginning Balance (in shares) at Sep. 30, 2018   33,157,852      
Beginning Balance at Sep. 30, 2018 79,894,876 $ 33,157 41,882,949 37,978,770 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of restricted common stock (in shares)   35,215      
Issuance of restricted common stock   $ 36 (36)    
Common share repurchases, including shares surrendered for tax withholding (48,646)       (48,646)
Retirements of treasury stock (in shares)   (6,402)      
Retirements of treasury stock   $ (7) (48,639)   48,646
Stock-based compensation 254,111   254,111    
Net income 3,904,565     3,904,565  
Common stock cash dividends (3,319,111)     (3,319,111)  
Ending Balance (in shares) at Dec. 31, 2018   33,186,665      
Ending Balance at Dec. 31, 2018 $ 80,685,795 $ 33,186 42,088,385 38,564,224 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)   271,778      
Issuance of restricted common stock   $ 272 (272)    
Forfeitures of restricted stock (in shares)   (49,118)      
Forfeitures of restricted stock   $ (49) 49    
Common share repurchases, including shares surrendered for tax withholding (in shares)   0      
Common share repurchases, including shares surrendered for tax withholding (1,750,839)       (1,750,839)
Retirements of treasury stock (in shares)   (299,402)      
Retirements of treasury stock   $ (299) (1,750,540)   1,750,839
Stock-based compensation 568,203   568,203    
Net income 4,557,738     4,557,738  
Common stock cash dividends $ (6,621,194)     (6,621,194)  
Ending Balance (in shares) at Dec. 31, 2019 33,106,988 33,106,988      
Ending Balance at Dec. 31, 2019 $ 76,879,766 $ 33,107 41,306,353 35,540,306 0
Beginning Balance (in shares) at Sep. 30, 2019   33,003,134      
Beginning Balance at Sep. 30, 2019 78,581,859 $ 33,003 41,458,682 37,090,174 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of restricted common stock (in shares)   212,750      
Issuance of restricted common stock 0 $ 213 (213)    
Forfeitures of restricted stock (in shares)   (40,870)      
Forfeitures of restricted stock   $ (41) 41    
Common share repurchases, including shares surrendered for tax withholding (in shares)   0      
Common share repurchases, including shares surrendered for tax withholding (388,415)       (388,415)
Retirements of treasury stock (in shares)   (68,026)      
Retirements of treasury stock   $ (68) (388,347)   388,415
Stock-based compensation 236,190   236,190    
Net income 1,764,918     1,764,918  
Common stock cash dividends $ (3,314,786)     (3,314,786)  
Ending Balance (in shares) at Dec. 31, 2019 33,106,988 33,106,988      
Ending Balance at Dec. 31, 2019 $ 76,879,766 $ 33,107 $ 41,306,353 $ 35,540,306 $ 0