Comprehensive Income Statement - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Comprehensive Income Statement
Net earnings	$ 3,238,217	$ 2,485,864	$ 20,164,140	$ 4,345,864
Other comprehensive income:
Unrealized gains (losses) on equity securities		(67,708)		(37,838)
Unrealized gains on derivative instruments		1,021		2,616
Foreign currency translation adjustments	(1,929)		(1,929)
Other comprehensive income, before income tax	(1,929)	(66,687)	(1,929)	(35,222)
Income tax expense	481	22,786	481	12,613
Other comprehensive income, net of income tax	(1,448)	(43,901)	(1,448)	(22,609)
Comprehensive income	$ 3,236,769	$ 2,441,963	$ 20,162,692	$ 4,323,255