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Summary of Significant Accounting Policies (Accumulated Other Comprehensive Earnings (Loss)) (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total other comprehensive earnings (loss) $ (1,710,846) $ 1,474,209  
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 2,953,936 (1,580,976)  
Cumulative-effect adjustment from ASU 2016-01     $ 1,366,297
Adjusted beginning balance 2,953,936 (214,679)  
Oher comprehensive earnings (loss) before reclassifications (1,526,960) 1,436,742  
Amount reclassified from accumulated other comprehensive earnings (183,886) 37,467  
Total other comprehensive earnings (loss) (1,710,846) 1,474,209  
Balance $ 1,243,090 $ 1,259,530