Any and all charges, by whatever name called, made, imposed, and/or collected from an insured and/or premium payor by a county mutual insurance company, shall constitute taxable premiums to the county mutual; except any interest or finance charge clearly identified in a premium note or other evidence of premium payable shall not be included as taxable premiums. The provisions of this section shall not apply to any county mutual insurance company whose business is devoted exclusively to the writing of industrial fire insurance policies covering dwellings, household goods, and wearing apparel on a weekly, monthly, or quarterly basis on a continuous premium payment plan.