Stockholders' Equity (Details) (USD $)	0 Months Ended				3 Months Ended				12 Months Ended					12 Months Ended
	Jan. 11, 2013	Apr. 05, 2012	Mar. 14, 2012	May 19, 2011	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Series A Junior Participating Preferred Stock [Member]	Jul. 20, 2012 Subsequent Event [Member] Series A Junior Participating Preferred Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2012 Chief Executive Officer [Member] Restricted Stock [Member]
Class of Stock [Line Items]
Common Stock, Dividends, Per Share, Declared			$ 0.05		$ 0.03	$ 0.03		$ 0.05	$ 0.08	$ 0.05	$ 0.05
Dividends, Common Stock, Cash		$ 518,000				$ 464,000	$ 518,000	$ 529,000	$ 982,000	$ 518,000	$ 529,000
Stock Issued During Period, Shares, New Issues	750,000					5,000,000
Additional Shares, sold in public offering, by stockholders						300,075
Proceeds from Issuance of Common Stock	3,631,000								23,947,000	0	0
Common stock, par value						$ 0.0001	$ 0.0001		$ 0.0001	$ 0.0001
Preferred Stock, Par or Stated Value Per Share						$ 0.0001	$ 0.0001		$ 0.0001	$ 0.0001		$ 0.0001
Class of Warrant or Right, Exercise Price of Warrants or Rights													27.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period														86,990	86,990
Treasury Stock, Shares, Acquired				212,083
Treasury Stock Acquired, Stated Cost Per Share				$ 2.00
Treasury Stock, Value				$ 431,000						$ 431,000
Treasury Stock Acquired, Average Cost Per Share				$ 2.03