Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income	$ 1,539,000	$ 1,103,000	$ 3,007,000	$ 2,457,000
Other comprehensive income (loss):
Change in unrealized loss on marketable securities, net of tax		(208,000)		(243,000)
Comprehensive income	$ 1,539,000	$ 895,000	$ 3,007,000	$ 2,214,000