Note 4 - Fair Value: Fair Value Measurements, by Fair Value hierarchy (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Investments, Fair Value Disclosure	$ 150,714,281	$ 143,862,165
Corporate Debt Securities
Investments, Fair Value Disclosure	310,125	328,781
US States and Political Subdivisions Debt Securities
Investments, Fair Value Disclosure	150,404,156	143,533,384
Fair Value, Inputs, Level 1
Investments, Fair Value Disclosure	310,125	328,781
Fair Value, Inputs, Level 1 | Corporate Debt Securities
Investments, Fair Value Disclosure	310,125	328,781
Fair Value, Inputs, Level 2
Investments, Fair Value Disclosure	150,404,156	143,533,384
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities
Investments, Fair Value Disclosure	$ 150,404,156	$ 143,533,384