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, 2019
Dec. 31, 2018
Jan. 27, 2015
Condensed Balance Sheet Statements, Captions [Line Items]      
Accumulated depreciation, leased property $ 105,825,816 $ 87,154,095  
Accumulated amortization, deferred costs $ 1,956,710 $ 1,290,236  
Preferred stock, par value (in dollars per share) $ 0.001    
Preferred stock, authorized (in shares) 10,000,000    
Preferred stock, outstanding (in shares) 50,197    
Capital stock non-convertible, par value (in dollars per share) $ 0.001 $ 0.001  
Capital stock non-convertible, shares issued (in shares) 13,638,916 11,960,225  
Capital stock non-convertible, shares outstanding (in shares) 13,638,916 11,960,225  
Capital stock non-convertible, shares authorized 100,000,000 100,000,000  
Convertible Debt      
Condensed Balance Sheet Statements, Captions [Line Items]      
Unamortized discount and debt issuance costs $ 3,768,504 $ 1,180,729  
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 $ 125,493,175 $ 125,555,675  
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, authorized (in shares) 10,000,000 10,000,000  
Preferred stock, issued (in shares) 50,197 50,222 22,500
Preferred stock, outstanding (in shares) 50,197 50,222  
Parent Company      
Condensed Balance Sheet Statements, Captions [Line Items]      
Accumulated depreciation, leased property $ 1,296,598 $ 1,112,218  
Accumulated amortization, deferred costs $ 1,198,023 $ 712,182  
Capital stock non-convertible, par value (in dollars per share) $ 0.001 $ 0.001  
Capital stock non-convertible, shares issued (in shares) 13,638,916 11,960,225  
Capital stock non-convertible, shares outstanding (in shares) 13,638,916 11,960,225  
Capital stock non-convertible, shares authorized 100,000,000 100,000,000  
Parent Company | Convertible Debt      
Condensed Balance Sheet Statements, Captions [Line Items]      
Unamortized discount and debt issuance costs $ 3,768,504 $ 1,180,729  
Parent Company | 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 $ 125,493,175 $ 125,555,675  
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, authorized (in shares) 10,000,000 10,000,000  
Preferred stock, issued (in shares) 50,197 50,222  
Preferred stock, outstanding (in shares) 50,197 50,222