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3. Investments (Details 4) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Amortized cost $ 3,824,620 $ 4,222,855
Estimated fair value 4,114,072 4,426,416
Less Than One Year [Member]    
Amortized cost 0 0
Estimated fair value 0 0
One To Five Years [Member]    
Amortized cost 2,598,323 2,996,685
Estimated fair value 2,705,549 3,036,531
Five To Ten Years [Member]    
Amortized cost 619,780 619,663
Estimated fair value 654,484 635,846
More Than 10 Years [Member]    
Amortized cost 606,517 606,507
Estimated fair value $ 754,039 $ 754,039