Calculation of Basic and Diluted Earnings per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Numerator:
Net Income (Loss)	$ 236	$ 1,837	$ 1,559	$ 1,396	$ 1,113	$ 1,067	$ 981	$ 675	$ 5,028	$ 3,836	$ 2,288
Preferred stock dividends					(1)			(15)		(16)	(60)
Numerator for basic earnings per share - income (loss) available to common shareholders	236	1,837	1,559	1,396	1,112	1,067	981	660	5,028	3,820	2,228
Effect of dilutive securities:									22	103	90
Numerator for diluted earnings per share - income (loss) available to common shareholders after assumed conversions	$ 236	$ 1,837	$ 1,559	$ 1,418	$ 1,134	$ 1,089	$ 1,003	$ 697	$ 5,050	$ 3,923	$ 2,318
Denominator:
Denominator for basic earnings per share - weighted-average shares	2,980	2,968	2,769	2,402	2,160	2,122	2,091	1,941	2,781	2,079	1,904
Effect of dilutive securities
Employee stock options									30	35	13
Warrants									447	533	302
6% Convertible Debentures									136	551	566
Preferred Stock										37
Dilutive potential common shares									613	1,119	881
Denominator for diluted earnings per share - weighted-average shares and assumed conversions	3,424	3,441	3,462	3,439	3,239	3,264	3,293	3,149	3,394	3,235	2,785
Basic earnings per common share:
Net Income (Loss)	$ 0.08	$ 0.62	$ 0.56	$ 0.58	$ 0.51	$ 0.50	$ 0.47	$ 0.34	$ 1.81	$ 1.84	$ 1.17
Diluted earnings per common share:
Net Income (Loss)	$ 0.07	$ 0.53	$ 0.45	$ 0.41	$ 0.35	$ 0.33	$ 0.30	$ 0.22	$ 1.49	$ 1.21	$ 0.83