Consolidated Statements of Comprehensive Income - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 1,137,000	$ 2,895,000	$ 7,250,000	$ 10,950,000
Other comprehensive income, net of tax:
Foreign currency translation	(427,000)	(314,000)	(784,000)	(196,000)
Net unrealized gain reclassified into income on sale of available-for-sale securities				(1,094,000)
Comprehensive income	$ 710,000	$ 2,581,000	$ 6,466,000	$ 9,660,000