Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income	$ 797,000	$ 288,000	$ 1,304,000	$ 436,000
Other comprehensive income (loss):
Change in unrealized gain (loss) on marketable securities, net of tax	18,000	(541,000)	(78,000)	(869,000)
Comprehensive income (loss)	$ 815,000	$ (253,000)	$ 1,226,000	$ (433,000)