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, 2018
Dec. 31, 2017
Jan. 27, 2015
Condensed Balance Sheet Statements, Captions [Line Items]      
Accumulated depreciation, leased property $ 87,154,095 $ 72,155,753  
Accumulated amortization, Deferred costs $ 1,290,236 $ 623,764  
Preferred stock, par value (in dollars per share) $ 0.001    
Preferred Stock, Shares Authorized 10,000,000    
Preferred stock, outstanding (in shares) 50,222.27    
Capital stock non-convertible, par value (in dollars per share) $ 0.001 $ 0.001  
Capital stock non-convertible, shares issued (in shares) 11,960,225 11,915,830  
Capital stock non-convertible, shares outstanding 11,960,225 11,915,830  
Capital stock non-convertible, shares authorized 100,000,000 100,000,000  
Convertible Debt      
Condensed Balance Sheet Statements, Captions [Line Items]      
Net of discount and debt issuance costs $ 1,180,729 $ 1,967,917  
Series A Cumulative Redeemable Preferred Stock      
Condensed Balance Sheet Statements, Captions [Line Items]      
Preferred stock interest rate 7.375% 7.375%  
Preferred Stock, Liquidation Preference $ 125,555,675 $ 130,000,000  
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 50,222 52,000 22,500
Preferred stock, outstanding (in shares) 50,222 52,000  
Parent Company      
Condensed Balance Sheet Statements, Captions [Line Items]      
Accumulated depreciation, leased property $ 1,112,218 $ 927,838  
Accumulated amortization, Deferred costs $ 712,182 $ 226,342  
Capital stock non-convertible, par value (in dollars per share) $ 0.001 $ 0.001  
Capital stock non-convertible, shares issued (in shares) 11,960,225 11,915,830  
Capital stock non-convertible, shares outstanding 11,960,225 11,915,830  
Capital stock non-convertible, shares authorized 100,000,000 100,000,000  
Parent Company | Convertible Debt      
Condensed Balance Sheet Statements, Captions [Line Items]      
Net of discount and debt issuance costs $ 1,180,729 $ 1,967,917  
Parent Company | Series A Cumulative Redeemable Preferred Stock      
Condensed Balance Sheet Statements, Captions [Line Items]      
Preferred stock interest rate 7.375%    
Preferred Stock, Liquidation Preference $ 125,555,675 $ 130,000,000  
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 50,222 52,000  
Preferred stock, outstanding (in shares) 50,222 52,000