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Stock-Based Incentive Plan - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 08, 2016
Restricted Stock and Contingent Restricted Stock            
Stock-Based Incentive Plan            
Stock-based compensation expense $ 352,420 $ 291,151   $ 1,324,230 $ 878,023  
Restricted Stock, Service-Based            
Stock-Based Incentive Plan            
Granted (in shares)     112,155      
Vesting period     1 year      
2016 Plan            
Stock-Based Incentive Plan            
Number of shares of common stock authorized for issuance under plan           1,100,000
Number of shares remaining available for grant under plan 987,845     987,845    
2004 Stock Plan | Restricted Stock and Contingent Restricted Stock            
Stock-Based Incentive Plan            
Expiration period       4 years    
2004 Stock Plan | Restricted Stock and Contingent Restricted Stock, Service-Based [Member]            
Stock-Based Incentive Plan            
Expiration period       4 years    
2004 Stock Plan | Restricted Stock and Contingent Restricted Stock, Other Awards [Member]            
Stock-Based Incentive Plan            
Expiration period       1 year    
2004 Stock Plan | Performance-based Awards            
Stock-Based Incentive Plan            
Vesting period       4 years    
Employees | Restricted Stock, Service-Based            
Stock-Based Incentive Plan            
Granted (in shares)     45,211      
Directors | Restricted Stock, Service-Based            
Stock-Based Incentive Plan            
Granted (in shares)     66,944