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Preferred Stock (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Feb. 16, 2016
May. 26, 2015
Mar. 31, 2016
Dec. 31, 2015
Jan. 30, 2009
Preferred stock, shares issued     20,000 30,000  
Number of shares called by Warrant         326,323
Exercise price of shares called by Warrant         $ 13.79
Preferred stock, value     $ 20,000,000 $ 30,000,000  
Payment for repurchase of warrant   $ 120,786      
Preferred dividend payment terms     The terms of the Series A Preferred Stock call for the payment, if declared by the Corporation's Board of Directors, of cash dividends on February 15th, May 15th, August 15th and November 15th of each year. The holders of the Series A Preferred Stock are entitled to receive, if and when declared by the Board of Directors, out of assets legally available for payment, cumulative cash dividends at a rate per annum of 9% per share of Series A Preferred Stock on a liquidation amount of $1,000 per share with respect to each dividend period from after February 15, 2014.    
Shares redeemed (value)     $ 10,000,000    
Series A Preferred Stock [Member]          
Preferred stock, shares issued     30,000 30,000 30,000
Preferred stock, value         $ 30,000,000
Preferred stock dividend rate     9.00% 9.00%  
Preferred stock liquidation preference per share     $ 1,000 $ 1,000  
Preferred stock redemption date Feb. 15, 2016        
Shares redeemed (in shares) 10,000        
Shares redeemed (value) $ 10,000,000