Consolidated Statements of Comprehensive Earnings (unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Statements of Comprehensive Earnings [Abstract]
Net earnings	$ 2,384,000	$ 2,159,000	$ 4,292,000	$ 3,870,000
Other comprehensive earnings (loss) before tax:
Foreign currency translation adjustments	(257,000)	(21,000)	(181,000)	111,000
Income tax expense related to items of other comprehensive earnings	0	0	0	(43,000)
Other comprehensive earnings (loss), net of tax	(257,000)	(21,000)	(181,000)	68,000
Comprehensive earnings	$ 2,127,000	$ 2,138,000	$ 4,111,000	$ 3,938,000