Idaho Code § 31-823
To levy a tax of not to exceed two hundredths per cent (.02%) of market value for assessment purposes on all the taxable property within their respective counties, for the purpose of creating a fund to be used for collecting, preparing and maintaining an exhibition of the products and industries of the county at any domestic or foreign exposition, for the purpose of encouraging immigration and increasing trade in the products of the state of Idaho, and for the same purposes, in the discretion of the commissioners to pay premiums or prizes for, and any costs or expenses of collecting, preparing, maintaining, exhibiting and advertising of like exhibitions, exhibited by others than the county at any such domestic or foreign exposition.
Idaho Code § 31-823