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Stockholders' Equity - Common Stock Dividends and Buyback Program (Details) - USD ($)
9 Months Ended 71 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
May 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of common stock outstanding (in shares) 33,507,452   33,507,452  
Cash dividends to common stockholders $ 2,666,334 $ 9,916,841    
Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of shares repurchased $ 7,348 $ 2,483,357    
Number of treasury shares acquired (in shares) 2,632 449,921    
Average cost per share (in dollars per share) $ 2.79 $ 5.52    
Common Stock | 2015 Share Repurchase Program        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized amount to be repurchased       $ 5,000,000.0
Value of shares repurchased     $ 4,000,000.0  
Treasury stock acquired (in shares) 0   706,858  
Average cost per share (in dollars per share)     $ 5.72