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Stockholders' Equity - Common Stock Dividends and Buyback Program (Details) - USD ($)
9 Months Ended 59 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
May 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of common stock outstanding (in shares) 32,956,469   32,956,469  
Cash dividends to common stockholders $ 9,916,841 $ 9,953,562    
Shares forfeited (in shares) 49,118      
Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of shares repurchased $ 2,483,357 $ 138,638    
Number of treasury shares acquired (in shares) 449,921 15,489    
Average cost per share (in dollars per share) $ 5.52 $ 8.95    
Common Stock | 2015 Share Repurchase Program        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized amount to be repurchased       $ 5,000,000
Value of shares repurchased     $ 4,000,000  
Treasury stock acquired (in shares) 440,666   706,858  
Average cost per share (in dollars per share) $ 5.51   $ 5.72