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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 678,149   678,149    
Net income 12,099,241     12,099,241  
Common stock cash dividends (9,953,562)     (9,953,562)  
Ending Balance (in shares) at Mar. 31, 2019   33,186,665      
Ending Balance at Mar. 31, 2019 79,974,669 $ 33,186 42,297,050 37,644,433 0
Beginning Balance (in shares) at Dec. 31, 2018   33,186,665      
Beginning Balance at Dec. 31, 2018 80,685,795 $ 33,186 42,088,385 38,564,224 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 208,665   208,665    
Net income 2,398,875     2,398,875  
Common stock cash dividends (3,318,666)     (3,318,666)  
Ending Balance (in shares) at Mar. 31, 2019   33,186,665      
Ending Balance at Mar. 31, 2019 $ 79,974,669 $ 33,186 42,297,050 37,644,433 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 (2,483,357)       (2,483,357)
Retirements of treasury stock (in shares)   (449,921)      
Retirements of treasury stock   $ (450) (2,482,907)   2,483,357
Stock-based compensation 926,794   926,794    
Net income 8,267,897     8,267,897  
Common stock cash dividends $ (9,916,841)     (9,916,841)  
Ending Balance (in shares) at Mar. 31, 2020 32,956,469 32,956,469      
Ending Balance at Mar. 31, 2020 $ 76,920,351 $ 32,956 40,932,577 35,954,818 0
Beginning Balance (in shares) at Dec. 31, 2019   33,106,988      
Beginning Balance at Dec. 31, 2019 76,879,766 $ 33,107 41,306,353 35,540,306 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Common share repurchases, including shares surrendered for tax withholding (in shares)   0      
Common share repurchases, including shares surrendered for tax withholding (732,518)       (732,518)
Retirements of treasury stock (in shares)   (150,519)      
Retirements of treasury stock   $ (151) (732,367)   732,518
Stock-based compensation 358,591   358,591    
Net income 3,710,159     3,710,159  
Common stock cash dividends $ (3,295,647)     (3,295,647)  
Ending Balance (in shares) at Mar. 31, 2020 32,956,469 32,956,469      
Ending Balance at Mar. 31, 2020 $ 76,920,351 $ 32,956 $ 40,932,577 $ 35,954,818 $ 0