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3. Investments (Details 1) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Amortized cost	$ 160,085,628	$ 155,431,261
Estimated fair value	164,334,869	151,777,516
Less Than One Year [Member]
Amortized cost	11,167,387	6,742,519
Estimated fair value	11,188,535	6,738,014
One To Five Years [Member]
Amortized cost	47,828,173	47,038,838
Estimated fair value	48,719,017	46,640,012
Five To Ten Years [Member]
Amortized cost	79,000,901	76,884,505
Estimated fair value	82,414,899	74,290,076
More Than 10 Years [Member]
Amortized cost	2,010,447	2,974,426
Estimated fair value	2,001,240	2,644,180
Residential mortgage-backed securities [Member]
Amortized cost	20,078,720	21,790,973
Estimated fair value	$ 20,011,178	$ 21,465,234

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