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3. Investments (Details 1) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Amortized Cost	$ 159,919,750	$ 155,431,261
Estimated Fair Value	160,477,152	151,777,516
Less Than One Year [Member]
Amortized Cost	14,232,940	6,742,519
Estimated Fair Value	14,242,115	6,738,014
One To Five Years [Member]
Amortized Cost	43,224,501	47,038,838
Estimated Fair Value	43,505,313	46,640,012
Five To Ten Years [Member]
Amortized Cost	77,839,224	76,884,505
Estimated Fair Value	78,416,804	74,290,076
More Than 10 Years [Member]
Amortized Cost	2,974,872	2,974,426
Estimated Fair Value	2,878,189	2,644,180
Residential mortgage-backed securities [Member]
Amortized Cost	21,648,213	21,790,973
Estimated Fair Value	$ 21,434,731	$ 21,465,234

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