3. Investments (Details 1) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Amortized cost	$ 152,675,779	$ 162,202,355
Estimated fair value	151,879,894	168,236,181
Less Than One Year
Amortized cost	12,900,401	11,986,401
Estimated fair value	12,937,879	12,025,804
One To Five Years
Amortized cost	44,309,018	49,715,422
Estimated fair value	44,695,085	51,000,025
Five To Ten Years
Amortized cost	65,324,015	69,850,104
Estimated fair value	66,293,522	74,410,275
More Than 10 Years
Amortized cost	4,511,318	4,511,795
Estimated fair value	4,114,335	4,568,847
Residential mortgage-backed securities [Member]
Amortized cost	25,631,027	26,138,633
Estimated fair value	$ 23,839,073	$ 26,231,230