Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net income	$ 3,625,000	$ 2,633,000
Other comprehensive loss:
Change in unrealized loss on marketable securities, net of tax		(254,000)
Comprehensive income	$ 3,625,000	$ 2,379,000