There is hereby assessed two (2) mills per bushel on all commodities delivered by producers to any public warehouse. The assessment shall be imposed on the warehouse at the time the commodity is received and shall be collected and remitted to the State Department of Agriculture by the warehouseman. Under the provisions of the Public Warehouse and Commodity Indemnity Act, no commodity shall be subject to a fee more than once. The State Board of Agriculture shall have authority to examine warehouse records to determine if the assessment has been properly remitted.