☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 UNITED STATES SECURITIES AND EXCHANGE COMMISSION OR Washington, D.C. 20549 FORM 10-K 2100 Highway 55, Medina, Minnesota 55340 (Address of Principal Executive Offices) (Zip Code) (Exact name of registrant as specified in its charter) (763) 542-0500 Registrant's telephone number, including area code Securities registered pursuant to Section 12(b) of the Act (State or other jurisdi ...