Investments (Schedule of Amortized Cost, Fair Value, Credit Rating) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Amortized Cost	$ 152,339,447	$ 116,676,312
States and Political Subdivisions - general obligations | US States and Political Subdivisions Debt Securities
Amortized Cost	239,454
Estimated Fair Value	251,233
States and Political Subdivisions - general obligations | US States and Political Subdivisions Debt Securities | Bellingham, Washington
Amortized Cost	107,420
Estimated Fair Value	$ 118,061
Credit Rating	AA+
States and Political Subdivisions - general obligations | US States and Political Subdivisions Debt Securities | Longview, Washington
Amortized Cost	$ 132,034
Estimated Fair Value	$ 133,172
Credit Rating	Aa3