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Preferred Stock (Narrative) (Details) - USD ($)
 12 Months Ended 53 Months Ended 61 Months Ended
Nov. 15, 2017
Mar. 21, 2017
Feb. 14, 2016
May 26, 2015
Dec. 31, 2017
Jun. 30, 2018
Feb. 28, 2014
Jan. 30, 2009
Number of shares called by Warrant               326,323
Exercise price of shares called by Warrant               $ 13.79
Shares redeemed (value)         $ 20,000,000      
Series A Preferred Stock [Member]                
Preferred stock, shares issued               30,000
Preferred stock, value               $ 30,000,000
Payment for repurchase of warrant       $ 120,786        
Preferred stock dividend rate           9.00% 5.00%  
Preferred stock liquidation preference per share           $ 1,000 $ 1,000  
Shares redeemed (in shares) 10,000 10,000 10,000          
Shares redeemed (value) $ 10,000,000 $ 10,000,000 $ 10,000,000