Preferred Stock (Narrative) (Details) - USD ($)				3 Months Ended	12 Months Ended
	Mar. 21, 2017	Feb. 14, 2016	May 26, 2015	Mar. 31, 2017	Dec. 31, 2016	Jan. 30, 2009
Number of shares called by Warrant						326,323
Exercise price of shares called by Warrant						$ 13.79
Preferred stock, value				$ 10,000,000	$ 20,000,000
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 and after February 15, 2014.
Shares redeemed (value)				$ 10,000,000	$ 10,000,000
Series A Preferred Stock [Member]
Preferred stock, shares issued				10,000	20,000	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	Mar. 21, 2017	Feb. 14, 2016
Shares redeemed (in shares)	10,000	10,000
Shares redeemed (value)	$ 10,000,000	$ 10,000,000