Preferred Stock (Details) (USD $)	12 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Mar. 25, 2004 item	Mar. 28, 2005	Dec. 02, 2005
Dividends Payable
Preferred stock dividends accrued during the period	$ 141,000	$ 151,000
Accrued and unpaid dividends	20,000	437,000
Series 1
Preferred Stock
Dividend rate (as a percent)			5.00%
Value of shares issued under private placement			5,000,000
Shares issued under private placement			1,000,000
Share issued price (in dollars per share)			$ 5.00
Issuance costs incurred for shares issued			275,000
Shares of common stock issued upon conversion of preferred stock	318,065		1,590,331
Conversion price per share (in dollars per share)			$ 3.144
Number of votes per share that holders of preferred stock will receive			1.5903
Liquidation preference value preferred stock price per share	$ 1,013	$ 1,251	$ 5.00
Redemption price per share (in dollars per share)			$ 5.00
Shares outstanding	200,000	220,000
Dividends Payable
Preferred stock dividends accrued during the period	51,000
Series 1 | G. Ward Paxton, chief executive officer
Preferred Stock
Shares issued under private placement			140,000
Series 1 | Director
Preferred Stock
Shares issued under private placement			60,000
Series 2
Preferred Stock
Dividend rate (as a percent)				5.00%
Value of shares issued under private placement				2,700,000
Shares issued under private placement				1,065,200
Share issued price (in dollars per share)				$ 2.50
Issuance costs incurred for shares issued				173,000
Shares of common stock issued upon conversion of preferred stock	460,000			1,065,200
Conversion price per share (in dollars per share)				$ 2.50
Liquidation preference value preferred stock price per share	$ 1,155	$ 1,313		$ 2.50
Shares outstanding	460,000	460,000
Dividends Payable
Preferred stock dividends accrued during the period	57,000
Series 2 | Minimum
Preferred Stock
Redemption price per share (in dollars per share)				$ 3.25
Series 2 | G. Ward Paxton, chief executive officer
Preferred Stock
Shares issued under private placement				260,000
Series 2 | Director
Preferred Stock
Shares issued under private placement				60,000
Series 2 | CFO
Preferred Stock
Shares issued under private placement				100,000
Series 3
Preferred Stock
Dividend rate (as a percent)					5.00%
Value of shares issued under private placement					1,200,000
Shares issued under private placement					564,607
Share issued price (in dollars per share)					$ 2.18
Issuance costs incurred for shares issued					100,000
Shares of common stock issued upon conversion of preferred stock	289,377				564,607
Conversion price per share (in dollars per share)					$ 2.18
Liquidation preference value preferred stock price per share	$ 634	$ 881			$ 2.18
Shares outstanding	289,000	354,000
Dividends Payable
Preferred stock dividends accrued during the period	$ 33,000
Series 3 | Minimum
Preferred Stock
Redemption price per share (in dollars per share)					$ 2.834
Series 3 | G. Ward Paxton, chief executive officer
Preferred Stock
Shares issued under private placement					123,853
Series 3 | Director
Preferred Stock
Shares issued under private placement					27,523
Series 3 | CFO
Preferred Stock
Shares issued under private placement					68,808