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3. Investments (Details 4) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Amortized cost $ 3,825,505 $ 4,222,855
Estimated fair value 4,127,384 4,426,416
Less Than One Year [Member]    
Amortized cost 623,000 0
Estimated fair value 629,143 0
One To Five Years [Member]    
Amortized cost 2,098,950 2,996,685
Estimated fair value 2,214,947 3,036,531
Five To Ten Years [Member]    
Amortized cost 497,016 619,663
Estimated fair value 529,255 635,846
More Than 10 Years [Member]    
Amortized cost 606,539 606,507
Estimated fair value $ 754,039 $ 754,039