Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

v3.20.4
Consolidated Balance Sheets (Parenthetical) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reserve for financing notes and related accrued interest receivable $ 600,000 $ 600,000
Deferred costs, accumulated amortization 2,130,334 1,956,710
Secured debt, debt issuance costs $ 0 $ 158,070
Preferred stock, par value (in dollars per share) $ 0.001  
Preferred stock, authorized (in shares) 10,000,000.0  
Preferred stock, outstanding (in shares) 50,108  
Capital stock non-convertible, par value (in dollars per share) $ 0.001 $ 0.001
Capital stock non-convertible, shares issued (in shares) 13,651,521 13,638,916
Capital stock non-convertible, shares outstanding (in shares) 13,651,521 13,638,916
Capital stock non-convertible, shares authorized (in shares) 100,000,000 100,000,000
Series A Cumulative Redeemable Preferred Stock    
Preferred stock interest rate 7.375% 7.375%
Preferred stock, liquidation preference $ 125,270,350 $ 125,493,175
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) 50,108 50,197
Preferred stock, outstanding (in shares) 50,108 50,197
Convertible Debt    
Unamortized discount and debt issuance costs $ 3,041,870 $ 3,768,504
Assets Leased to Others    
Accumulated depreciation 6,832,167 105,825,816
Property, Plant and Equipment, Other Types    
Accumulated depreciation $ 22,580,810 $ 19,304,610