Preferred Stock (Details)				12 Months Ended
	Dec. 02, 2005 USD ($) $ / shares shares	Mar. 28, 2005 USD ($) $ / shares shares	Mar. 25, 2004 USD ($) item $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares
Dividends Payable
Preferred stock dividends accrued during the period | $				$ 139,000	$ 141,000
Accrued and unpaid dividends | $				$ 160,000	$ 20,000
Series 1
Preferred Stock
Value of shares issued under private placement | $			$ 5,000,000
Dividend rate (as a percent)			5.00%
Shares issued under private placement			1,000,000
Share issued price (in dollars per share) | $ / shares			$ 5.00
Gross proceeds from issuance of preferred stock | $			$ 5,000,000
Issuance costs incurred for shares issued | $			$ 275,000
Shares of common stock issued upon conversion of preferred stock			1,590,331	318,065
Conversion price per share (in dollars per share) | $ / shares			$ 3.144
Number of votes per share that holders of preferred stock will receive | item			1.5903
Liquidation preference value preferred stock price per share | $ / shares			$ 5.00	$ 1,063	$ 1,013
Redemption price per share (in dollars per share) | $ / shares			$ 5.00
Shares outstanding				200,000	200,000
Dividends Payable
Preferred stock dividends accrued during the period | $				$ 50,000
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
Value of shares issued under private placement | $		$ 2,700,000
Dividend rate (as a percent)		5.00%
Shares issued under private placement		1,065,200
Share issued price (in dollars per share) | $ / shares		$ 2.50
Gross proceeds from issuance of preferred stock | $		$ 2,700,000
Issuance costs incurred for shares issued | $		$ 173,000
Shares of common stock issued upon conversion of preferred stock		1,065,200		460,000
Conversion price per share (in dollars per share) | $ / shares		$ 2.50
Liquidation preference value preferred stock price per share | $ / shares		2.50		$ 1,212	$ 1,155
Shares outstanding				460,000	460,000
Dividends Payable
Preferred stock dividends accrued during the period | $				$ 58,000
Series 2 | Minimum
Preferred Stock
Redemption price per share (in dollars per share) | $ / shares		$ 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
Value of shares issued under private placement | $	$ 1,200,000
Dividend rate (as a percent)	5.00%
Shares issued under private placement	564,607
Share issued price (in dollars per share) | $ / shares	$ 2.18
Gross proceeds from issuance of preferred stock | $	$ 1,200,000
Issuance costs incurred for shares issued | $	$ 100,000
Shares of common stock issued upon conversion of preferred stock	564,607			289,377
Conversion price per share (in dollars per share) | $ / shares	$ 2.18
Liquidation preference value preferred stock price per share | $ / shares	2.18			$ 665	$ 634
Shares outstanding				289,000	289,000
Dividends Payable
Preferred stock dividends accrued during the period | $				$ 32,000
Series 3 | Minimum
Preferred Stock
Redemption price per share (in dollars per share) | $ / shares	$ 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