Investments (Schedule of Amortized Cost, Fair Value, Credit Rating) (Details)	9 Months Ended
	Sep. 30, 2019 USD ($)
Amortized Cost	$ 66,897,963
States and Political Subdivisions - general obligations | US States and Political Subdivisions Debt Securities
Amortized Cost	262,079
Estimated Fair Value	267,601
States and Political Subdivisions - general obligations | US States and Political Subdivisions Debt Securities | Bellingham, Washington
Amortized Cost	107,999
Estimated Fair Value	$ 111,904
Credit Rating	AA+
States and Political Subdivisions - general obligations | US States and Political Subdivisions Debt Securities | Longview, Washington
Amortized Cost	$ 154,080
Estimated Fair Value	$ 155,697
Credit Rating	Aa3