Earnings Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator:
Net earnings	$ 1,002	$ 710	$ 1,294	$ 1,082
Denominator:
Weighted-average common shares outstanding	25,257	24,522	25,283	24,391
Basic earnings per common share	$ 0.04	$ 0.03	$ 0.05	$ 0.04
Numerator:
Net earnings	$ 1,002	$ 710	$ 1,294	$ 1,082
Denominator:
Weighted-average common shares outstanding	25,257	24,522	25,283	24,391
Incremental shares from stock-based compensation plans	552	427	504	351
Denominator for diluted earnings per common share	25,809	24,949	25,787	24,742
Diluted earnings per common share	$ 0.04	$ 0.03	$ 0.05	$ 0.04