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Investments - Schedule of maturities (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Cost    
Less than 1 year $ 471,139  
1 to 3 years 2,258,686  
Total 2,729,825 $ 6,406,062
Fair Value    
Less than 1 year 480,478  
1 to 3 years 2,287,809  
Total $ 2,768,287 $ 6,349,915