Annual report pursuant to Section 13 and 15(d)

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Balance Sheet Parenthetical (Details)

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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Balance Sheet Parenthetical (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jan. 27, 2015
Condensed Balance Sheet Statements, Captions [Line Items]      
Accumulated depreciation, leased property $ 72,155,753 $ 52,219,717  
Accumulated amortization, Deferred costs $ 623,764 $ 2,261,151  
Preferred stock, par value (in dollars per share) $ 0.001    
Preferred Stock, Shares Authorized 10,000,000    
Capital stock non-convertible, par value (in dollars per share) $ 0.001 $ 0.001  
Capital stock non-convertible, shares issued (in shares) 11,915,830 11,886,216  
Capital stock non-convertible, shares outstanding 11,915,830 11,886,216  
Capital stock non-convertible, shares authorized 100,000,000 100,000,000  
Convertible Debt [Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Net of discount and debt issuance costs $ 1,967,917 $ 2,755,105  
Series A Cumulative Redeemable Preferred Stock [Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Preferred stock interest rate 7.375%    
Preferred Stock, Liquidation Preference $ 130,000,000 $ 56,250,000  
Preferred Stock, Liquidation Preference (in dollars per share) $ 2,500 $ 2,500  
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001  
Preferred Stock, Shares Authorized 10,000,000 10,000,000  
Preferred Stock, Shares Issued 52,000 22,500 22,500
Preferred Stock, Shares Outstanding 52,000 22,500  
Parent Company [Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Accumulated depreciation, leased property $ 927,838 $ 743,458  
Accumulated amortization, Deferred costs $ 226,342 $ 1,240,297  
Capital stock non-convertible, par value (in dollars per share) $ 0.001 $ 0.001  
Capital stock non-convertible, shares issued (in shares) 11,915,830 11,886,216  
Capital stock non-convertible, shares outstanding 11,915,830 11,886,216  
Capital stock non-convertible, shares authorized 100,000,000 100,000,000  
Parent Company [Member] | Convertible Debt [Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Net of discount and debt issuance costs $ 1,967,917 $ 2,755,105  
Parent Company [Member] | Series A Cumulative Redeemable Preferred Stock [Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Preferred stock interest rate 7.375%    
Preferred Stock, Liquidation Preference $ 130,000,000 $ 56,250,000  
Preferred Stock, Liquidation Preference (in dollars per share) $ 2,500 $ 2,500  
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001  
Preferred Stock, Shares Authorized 10,000,000 10,000,000  
Preferred Stock, Shares Issued 52,000 22,500  
Preferred Stock, Shares Outstanding 52,000 22,500