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Stock-Based Incentive Plan - Narrative (Details) - USD ($)
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 08, 2016
Restricted Stock and Contingent Restricted Stock      
Stock-Based Incentive Plan      
Stock-based compensation expense $ 215,373 $ 487,484  
Restricted Stock, Market-Based      
Stock-Based Incentive Plan      
Granted (in shares) 43,990    
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 887,326    
2004 Stock Plan | Restricted Stock and Contingent Restricted Stock, Other Awards [Member]      
Stock-Based Incentive Plan      
Vesting period 1 year    
2004 Stock Plan | Restricted Stock, Service-Based      
Stock-Based Incentive Plan      
Granted (in shares) 31,777    
2004 Stock Plan | Restricted Stock, Market-Based      
Stock-Based Incentive Plan      
Granted (in shares) 43,990    
Minimum | 2004 Stock Plan | Restricted Stock, Service-Based      
Stock-Based Incentive Plan      
Vesting period 3 years    
Minimum | 2004 Stock Plan | Restricted Stock, Market-Based      
Stock-Based Incentive Plan      
Vesting period 2 years    
Maximum | 2004 Stock Plan | Restricted Stock and Contingent Restricted Stock      
Stock-Based Incentive Plan      
Expiration period 4 years    
Maximum | 2004 Stock Plan | Restricted Stock, Service-Based      
Stock-Based Incentive Plan      
Vesting period 4 years    
Maximum | 2004 Stock Plan | Restricted Stock, Market-Based      
Stock-Based Incentive Plan      
Vesting period 3 years