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Earnings per Share Basis and Diluted (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Numerator
Net income	$ 1,734	$ 1,734	$ 1,191	$ 1,191
Denominator
Weighted average shares (basic)	27,757,397		27,166,973
Dilutive effect of potential common shares	1,608,000		1,117,000
Weighted average shares (diluted)	29,365,342		28,284,044
Basic earnings per share	$ 0.06	$ 0.06	$ 0.04
Diluted earnings per share	$ 0.06	$ 0.06	$ 0.04

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