Consolidated Statements of Comprehensive Income (Loss) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Net income	$ 3,168,000	$ 1,041,000
Other comprehensive loss:
Change in unrealized loss on marketable securities, net of tax	(56,000)	(1,523,000)
Total other comprehensive loss	(56,000)	(1,523,000)
Comprehensive income (loss)	$ 3,112,000	$ (482,000)