CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 395,474	$ 18,089	$ 454,601	$ 3,822
Other comprehensive loss
Unrealized loss on investment in equity securities		(46,926)		(92,589)
Comprehensive gain (loss)	$ 395,474	$ (28,837)	$ 454,601	$ (88,767)