Quarterly report pursuant to Section 13 or 15(d)

Stockholder's Equity (Details)

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Stockholder's Equity (Details)
 6 Months Ended 12 Months Ended
Dec. 01, 2015
Jan. 27, 2015
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Feb. 18, 2016
USD ($)
Class of Stock [Line Items]          
Preferred stock, authorized | shares     10,000,000    
Preferred stock, par value | $ / shares     $ 0.001    
Net offering proceeds | $   $ 54,200,000      
Shares of common stock offered (in shares) | shares     11,869,828 11,939,697  
Repurchase of common stock | $     $ 2,041,851    
Aggregate offering price of shelf registration | $         $ 600,000,000
Reinvestment of dividends paid to common stockholders | $     $ 331,823 $ 817,915  
Reverse stock split ratio 0.2        
CORRPrA [Member]          
Class of Stock [Line Items]          
Preferred stock, par value | $ / shares     $ 23    
Series A Cumulative Redeemable Preferred Stock [Member]          
Class of Stock [Line Items]          
Preferred stock, authorized | shares     10,000,000 10,000,000  
Preferred stock, par value | $ / shares     $ 0.001 $ 0.001  
Preferred stock, issued | shares   22,500 22,500 22,500  
Preferred stock, liquidation preference (in dollars per share) | $ / shares     $ 2,500 $ 2,500  
Depositary Shares [Member]          
Class of Stock [Line Items]          
Annual dividend, per share (in dollars per share) | $ / shares   $ 1.84375      
Percent equivalent of preferred shares     1.00%    
Preferred Stock [Member] | Series A Cumulative Redeemable Preferred Stock [Member]          
Class of Stock [Line Items]          
Coupon rate percentage   7.375% 7.375%    
Common Stock [Member]          
Class of Stock [Line Items]          
Shares sold in offering (in shares) | shares       2,587,500  
Authorized amount of shares to be repurchased | $       $ 10,000,000  
Repurchase of common stock (in shares) | shares     90,613    
Repurchase of common stock | $     $ 91    
Reinvestment of distributions to stockholders (in shares) | shares     19,233 28,510  
Reinvestment of dividends paid to common stockholders | $     $ 19 $ 29  
Underwritten Public Offering [Member] | Depositary Shares [Member]          
Class of Stock [Line Items]          
Shares sold in offering (in shares) | shares   2,250,000      
Preferred stock, liquidation preference (in dollars per share) | $ / shares   $ 25.00      
Dividend Reinvestment Plan [Member]          
Class of Stock [Line Items]          
Reinvestment of distributions to stockholders (in shares) | shares     19,233    
Reinvestment of dividends paid to common stockholders | $     $ 332,000    
Shelf registration after dividend reinvestment plan reduction | $     $ 599,700,000