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3. Investments (Details 1) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Amortized cost	$ 160,601,004	$ 155,431,261
Estimated fair value	166,220,712	151,777,516
Less Than One Year [Member]
Amortized cost	12,273,128	6,742,519
Estimated fair value	12,322,490	6,738,014
One To Five Years [Member]
Amortized cost	50,106,836	47,038,838
Estimated fair value	51,297,620	46,640,012
Five To Ten Years [Member]
Amortized cost	74,473,145	76,884,505
Estimated fair value	78,850,661	74,290,076
More Than 10 Years [Member]
Amortized cost	2,010,182	2,974,426
Estimated fair value	2,047,580	2,644,180
Residential mortgage-backed securities [Member]
Amortized cost	21,737,713	21,790,973
Estimated fair value	$ 21,702,361	$ 21,465,234

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