(1) Every brewer and every beer importer licensed or registered to do business in this state shall, on or before the 15th day of each month, as prescribed by the department, make an exact return to the department of the amount of beer manufactured or imported by the brewer or importer, the amount sold by the brewer or importer in the previous month, and the inventory of the brewer or importer. The department may make an examination of any brewer's or beer importer's books and of the brewer's or importer's premises and otherwise check the accuracy of any return or check the alcoholic content of beer manufactured or imported by the brewer or importer.
(2) Every retailer licensed to do business in this state shall, on or before the 15th day of each month, as prescribed by the department, make an exact return to the department of the amount of beer purchased in the previous month directly from any brewery not located in the state of Montana.