Annual report pursuant to Section 13 and 15(d)

Debt - Long Term Debt Maturities (Details)

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Debt - Long Term Debt Maturities (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total $ 152,777,437 $ 200,632,880
Secured Debt [Member]    
Debt Instrument [Line Items]    
2018 3,528,000  
2019 3,528,000  
2020 3,528,000  
2021 3,528,000  
2022 26,888,000  
Thereafter 0  
Total $ 41,000,000