Preferred Stock (Narrative) (Details) - USD ($)							12 Months Ended
	Nov. 15, 2017	Mar. 27, 2017	Feb. 14, 2016	Feb. 15, 2014	Feb. 14, 2014	Jan. 30, 2009	Dec. 31, 2017	Dec. 31, 2016	May 26, 2015
Preferred stock, shares issued						30,000
Class of warrant or right, number of securities called by warrants or rights						326,323
Class of warrant or right, exercise price of warrants or rights						$ 13.79
Proceeds from issuance of preferred stock and preference stock						$ 30,000,000
Repurchase of warrant									$ 120,786
Preferred stock, dividend rate, percentage				9.00%	5.00%
Preferred stock, liquidation preference per share				$ 1,000	$ 1,000
Aggregate liquidation amount of Preferred Stock	$ 10,000,000	$ 10,000,000	$ 10,000,000
Preferred stock redeemed, shares	10,000	10,000	10,000
Proceeds from issuance of common stock							$ 9,191,000	$ 0
Series A Preferred Stock [Member]
Preferred stock, shares issued							0	20,000,000
Preferred stock, shares outstanding							0	20,000
Preferred stock, dividend rate, percentage							9.00%	9.00%
Preferred stock, liquidation preference per share							$ 1,000	$ 1,000