Annual report pursuant to Section 13 and 15(d)

Subsequent Events (Details)

v3.10.0.1
Subsequent Events (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 23, 2019
Jan. 16, 2019
Jan. 09, 2019
May 23, 2016
Jan. 27, 2015
Mar. 31, 2019
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Subsequent Event [Line Items]                          
Repurchases of preferred stock                     $ 4,275,553 $ 0 $ 0
Preferred stock, outstanding (in shares)                     50,222.27    
Face amount                     $ 42,000    
Shares issued (in shares)                     1,271    
Common stock, par value (in dollars per share)             $ 0.001       $ 0.001 $ 0.001  
Repurchases of convertible debt       $ 1,000,000             $ 0 $ 0 899,960
Loss on extinguishment of debt             $ 102,500 $ 234,433 $ 0 $ 0 $ 0 $ 336,933 $ 0
Dividends declared per share (in dollars per share)                     $ 3.000 $ 3.000 $ 3.000
Subsequent event                          
Subsequent Event [Line Items]                          
Face amount   $ 43,800,000                      
Shares issued (in shares)   837,040                      
Repurchases of convertible debt   $ 19,800,000                      
Convertible debt outstanding   $ 70,200,000                      
Capital Stock                          
Subsequent Event [Line Items]                          
Repurchase of stock (in shares)                         90,613
Capital Stock | Subsequent event                          
Subsequent Event [Line Items]                          
Dividends declared per share (in dollars per share) $ 0.750                        
Depositary Shares                          
Subsequent Event [Line Items]                          
Repurchase of stock (in shares)                     177,773    
Repurchases of preferred stock                     $ 4,300,000    
Preferred stock, outstanding (in shares)                     5,022,227    
Series A Cumulative Redeemable Preferred Stock                          
Subsequent Event [Line Items]                          
Preferred stock, outstanding (in shares)             52,000       50,222 52,000  
Coupon rate percentage                     7.375% 7.375%  
Series A Cumulative Redeemable Preferred Stock | Depositary Shares | Subsequent event                          
Subsequent Event [Line Items]                          
Repurchase of stock (in shares)     2,500                    
Repurchases of preferred stock     $ 61,000                    
Preferred stock, outstanding (in shares)     5,019,727                    
Depositary stock, dividends declared per share (in dollars per share) $ 0.4609375                        
Series A Cumulative Redeemable Preferred Stock | Preferred Stock                          
Subsequent Event [Line Items]                          
Coupon rate percentage         7.375%           7.375%    
Series A Cumulative Redeemable Preferred Stock | Preferred Stock | Subsequent event                          
Subsequent Event [Line Items]                          
Preferred stock, outstanding (in shares)     50,197.27                    
Forecast                          
Subsequent Event [Line Items]                          
Loss on extinguishment of debt           $ 5,000,000