Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net income	$ 1,019,000	$ 306,000	$ 2,323,000	$ 741,000
Other comprehensive income (loss):
Change in unrealized gain (loss) on marketable securities, net of tax	28,000	(452,000)	(50,000)	(1,321,000)
Comprehensive income (loss)	$ 1,047,000	$ (146,000)	$ 2,273,000	$ (580,000)