Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Additional Information (Details)

v3.8.0.1
Fair Value - Additional Information (Details)
 3 Months Ended
Dec. 21, 2017
USD ($)
Mar. 31, 2018
USD ($)
Bcf / d
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]      
Investments at fair value   $ 2,972,281 $ 2,958,315
Lightfoot Capital Partners LP [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity interest percentage   6.60% 6.60%
Lightfoot GP [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity interest percentage   1.50% 1.50%
Lightfoot Capital Partners LP [Member] | Gulf LNG [Member]      
Schedule of Equity Method Investments [Line Items]      
Receiving and regasification terminal, volume per day (bcf/d) | Bcf / d   1.5  
Arc Terminal Joliet Holdings [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity interest percentage   0.60%  
Lightfoot and Arc Terminal Joliet Holdings [Member]      
Schedule of Equity Method Investments [Line Items]      
Investment percentage of total assets   0.50%  
Gulf LNG [Member] | Zenith [Member]      
Schedule of Equity Method Investments [Line Items]      
Percentage of interest acquired 4.16%    
Payment to acquire $ 27,300,000