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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 at Jun. 30, 2017 $ 68,469,855 $ 33,087 $ 40,961,957 $ 27,474,811 $ 0
Beginning Balance (shares) at Jun. 30, 2017   33,087,308      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of restricted common stock (shares)   158,785      
Issuance of restricted common stock   $ 158 (158)    
Forfeitures of restricted stock (shares)   (19,561)      
Forfeitures of restricted stock   $ (20) 20    
Common share repurchases, including shares surrendered for tax withholding (shares)   (55,018)      
Common share repurchases, including shares surrendered for tax withholding (395,550)       (395,550)
Retirements of treasury stock   $ (54) (395,496)   395,550
Stock-based compensation 1,324,230   1,324,230    
Net income attributable to the Company 15,085,734     15,085,734  
Common stock cash dividends (8,286,486)     (8,286,486)  
Ending Balance at Mar. 31, 2018 76,197,783 $ 33,171 41,890,553 34,274,059 0
Ending Balance (shares) at Mar. 31, 2018   33,171,514      
Beginning Balance at Dec. 31, 2017 76,094,160 $ 33,171 41,538,133 34,522,856 0
Beginning Balance (shares) at Dec. 31, 2017   33,171,514      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 352,420   352,420    
Net income attributable to the Company 3,068,354     3,068,354  
Common stock cash dividends (3,317,151)     (3,317,151)  
Ending Balance at Mar. 31, 2018 76,197,783 $ 33,171 41,890,553 34,274,059 0
Ending Balance (shares) at Mar. 31, 2018   33,171,514      
Beginning Balance at Jun. 30, 2018 $ 77,289,479 $ 33,080 41,757,645 35,498,754 0
Beginning Balance (shares) at Jun. 30, 2018 33,080,543 33,080,543      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of restricted common stock (shares)   121,611      
Issuance of restricted common stock   $ 122 (122)    
Common share repurchases, including shares surrendered for tax withholding (shares)   (15,489)      
Common share repurchases, including shares surrendered for tax withholding $ (138,638)       (138,638)
Retirements of treasury stock   $ (16) (138,622)   138,638
Stock-based compensation 678,149   678,149    
Net income attributable to the Company 12,099,241     12,099,241  
Common stock cash dividends (9,953,562)     (9,953,562)  
Ending Balance at Mar. 31, 2019 $ 79,974,669 $ 33,186 42,297,050 37,644,433 0
Ending Balance (shares) at Mar. 31, 2019 33,186,665 33,186,665      
Beginning Balance at Dec. 31, 2018 $ 80,685,795 $ 33,186 42,088,385 38,564,224 0
Beginning Balance (shares) at Dec. 31, 2018   33,186,665      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 208,665   208,665    
Net income attributable to the Company 2,398,875     2,398,875  
Common stock cash dividends (3,318,666)     (3,318,666)  
Ending Balance at Mar. 31, 2019 $ 79,974,669 $ 33,186 $ 42,297,050 $ 37,644,433 $ 0
Ending Balance (shares) at Mar. 31, 2019 33,186,665 33,186,665