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Senior Secured Credit Agreement (Details) - Senior Secured Reserve-Based Credit Facility - Line of Credit - Revolving credit facility
Apr. 11, 2016
USD ($)
Mar. 31, 2018
USD ($)
Feb. 01, 2018
USD ($)
Line of Credit Facility [Line Items]      
Term of revolving credit facility 3 years    
Maximum amount available under revolving credit facility $ 50,000,000    
Initial borrowing base $ 10,000,000   $ 40,000,000
Amount outstanding   $ 0  
Placement fee percentage 0.50%    
Placement fee percentage $ 50,000    
Commitment fee percentage 0.25%    
Maximum total leverage ratio (not more than) 3.00    
Debt service coverage ratio (not less than) 1.10    
Minimum consolidated tangible net worth $ 40,000,000    
Debt issuance costs $ 168,972    
Unamortized debt issuance costs   $ 56,268  
LIBOR      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 2.75%    
Prime rate      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.00%