Consolidated Statements of Comprehensive Earnings (unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Comprehensive Earnings (unaudited) [Abstract]
Net earnings	$ 2,565,000	$ 3,710,000	$ 6,858,000	$ 7,580,000
Other comprehensive earnings (loss), net of tax:
Foreign currency translation adjustments	78,000	(221,000)	(53,000)	(110,000)
Comprehensive earnings	$ 2,643,000	$ 3,489,000	$ 6,805,000	$ 7,470,000