MINNEAPOLIS--(BUSINESS WIRE)--Directors of Tennant Company (NYSE: TNC) today declared a regular quarterly cash dividend of 20 cents per share payable September 15, 2015, to shareholders of record at the close of business on August 31, 2015. Company ProfileMinneapolis-based Tennant Company (NYSE: TNC) is a world leader in designing, manufacturing and marketing solutions that empower customers to achieve quality cleaning performance, significantly reduce their environmental impact and help create