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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
Total
Preferred
Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock
Balance at Jun. 30, 2015 $ 48,576,577 $ 317 $ 32,845 $ 36,847,289 $ 11,696,126 $ 0
Balance (shares) at Jun. 30, 2015   317,319 32,845,205      
Increase (Decrease) in Stockholders' Equity            
Issuance of restricted common stock 33   $ 272 (239)    
Issuance of restricted common stock (shares)     272,098      
Exercise of stock options 127,500   $ 50 127,450    
Exercise of stock options (shares)     50,000      
Forfeiture of restricted stock     $ (41) 41    
Forfeiture of restricted stock (shares)     (40,758)      
Common share repurchases, including shares surrendered for tax withholding (1,263,402)         (1,263,402)
Common share repurchases, including shares surrendered for tax withholding (shares)     (218,682)      
Retirements of treasury stock     $ (219) (1,263,183)   1,263,402
Stock-based compensation 1,809,548     1,809,548    
Tax benefits related to stock-based compensation 9,650,657     9,650,657    
Net income 24,660,362       24,660,362  
Common stock cash dividends (6,565,823)       (6,565,823)  
Preferred stock cash dividends (674,302)       (674,302)  
Balance at Jun. 30, 2016 76,321,150 $ 317 $ 32,907 47,171,563 29,116,363 0
Balance (shares) at Jun. 30, 2016   317,319 32,907,863      
Increase (Decrease) in Stockholders' Equity            
Issuance of restricted common stock 32   $ 228 (196)    
Issuance of restricted common stock (shares)     227,889      
Exercise of stock options $ 77,156   $ 35 77,121    
Exercise of stock options (shares) 35,231   35,231      
Common share repurchases, including shares surrendered for tax withholding $ (537,014)         (537,014)
Common share repurchases, including shares surrendered for tax withholding (shares)     (83,675)      
Retirements of treasury stock     $ (83) (536,931)   537,014
Stock-based compensation 1,180,618     1,180,618    
Redemption of preferred shares (7,932,975) $ (317)   (6,930,218) (1,002,440)  
Redemption of preferred shares (shares)   (317,319)        
Net income 8,044,313       8,044,313  
Common stock cash dividends (8,432,435)       (8,432,435)  
Preferred stock cash dividends (250,990)       (250,990)  
Balance at Jun. 30, 2017 68,469,855 $ 0 $ 33,087 40,961,957 27,474,811 0
Balance (shares) at Jun. 30, 2017   0 33,087,308      
Increase (Decrease) in Stockholders' Equity            
Issuance of restricted common stock 0   $ 183 (183)    
Issuance of restricted common stock (shares)     183,537      
Forfeiture of restricted stock     $ (117) 117    
Forfeiture of restricted stock (shares)     (117,094)      
Common share repurchases, including shares surrendered for tax withholding (571,083)         (571,083)
Common share repurchases, including shares surrendered for tax withholding (shares)     (73,208)      
Retirements of treasury stock     $ (73) (571,010)   571,083
Stock-based compensation 1,366,764     1,366,764    
Net income 19,618,484       19,618,484  
Common stock cash dividends (11,594,541)       (11,594,541)  
Balance at Jun. 30, 2018 $ 77,289,479 $ 0 $ 33,080 $ 41,757,645 $ 35,498,754 $ 0
Balance (shares) at Jun. 30, 2018   0 33,080,543