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Comprehensive Income Statement - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Comprehensive Income Statement    
Net earnings $ 16,925,923 $ 1,860,000
Other comprehensive income:    
Unrealized gains on equity securities   29,871
Unrealized gains on derivative instruments   1,595
Other comprehensive income, before income tax   31,466
Income tax expense   (10,174)
Other comprehensive income, net of income tax   21,292
Comprehensive income $ 16,925,923 $ 1,881,292