The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F INFORMATION TABLE
OMB APPROVAL
OMB Number: 3235-0006
Estimated average burden
hours per response: 23.8
COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8
VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER VOTING AUTHORITY
NAME OF ISSUER TITLE OF CLASS CUSIP (x$1000) PRN AMT PRN CALL DISCRETION MANAGER SOLE SHARED NONE
3M CO COM 88579Y101 172,877 985,502 SH   SOLE   631,961 0 353,540
AAR CORP COM 000361105 12,374 381,569 SH   SOLE   381,569 0 0
ABBOTT LABS COM 002824100 178,221 1,508,686 SH   SOLE   1,064,150 0 444,536
ABBVIE INC COM 00287Y109 5,467 50,678 SH   SOLE   20,599 0 30,079
ACCENTURE PLC IRELAND SHS CLASS A G1151C101 419 1,310 SH   SOLE   764 0 546
ACTIVISION BLIZZARD INC COM 00507V109 85,893 1,109,875 SH   SOLE   982,670 0 127,205
ADOBE SYSTEMS INCORPORATED COM 00724F101 754 1,310 SH   SOLE   10 0 1,300
ALLETE INC COM NEW 018522300 1,369 22,997 SH   SOLE   10,214 0 12,783
ALLIANT ENERGY CORP COM 018802108 43,491 776,895 SH   SOLE   627,978 0 148,917
ALPHABET INC CAP STK CL A 02079K305 3,417 1,278 SH   SOLE   1,095 0 183
ALPHABET INC CAP STK CL C 02079K107 617,702 231,756 SH   SOLE   193,611 0 38,145
ALTRIA GROUP INC COM 02209S103 228 5,019 SH   SOLE   2,519 0 2,500
AMAZON COM INC COM 023135106 351,844 107,105 SH   SOLE   98,137 0 8,968
AMCOR PLC ORD G0250X107 3,334 287,663 SH   SOLE   167,779 0 119,884
AMERICAN EXPRESS CO COM 025816109 104,523 623,906 SH   SOLE   424,581 0 199,325
AMERICAN TOWER CORP NEW COM 03027X100 536 2,020 SH   SOLE   0 0 2,020
AMERIPRISE FINL INC COM 03076C106 624 2,362 SH   SOLE   1,710 0 652
AMETEK INC COM 031100100 299 2,411 SH   SOLE   2,411 0 0
AMGEN INC COM 031162100 1,835 8,630 SH   SOLE   5,984 0 2,646
APPLE INC COM 037833100 19,371 136,897 SH   SOLE   64,968 0 71,929
APPLIED MATLS INC COM 038222105 705 5,477 SH   SOLE   0 0 5,477
ASSOCIATED BANC CORP COM 045487105 7,402 345,553 SH   SOLE   345,553 0 0
AT&T INC COM 00206R102 776 28,733 SH   SOLE   11,006 0 17,727
AUTODESK INC COM 052769106 235 825 SH   SOLE   825 0 0
AUTOMATIC DATA PROCESSING IN COM 053015103 3,774 18,877 SH   SOLE   16,277 0 2,600
AXOGEN INC COM 05463X106 431 27,299 SH   SOLE   27,299 0 0
AZEK CO INC CL A 05478C105 4,056 111,026 SH   SOLE   111,026 0 0
BADGER METER INC COM 056525108 20,254 200,256 SH   SOLE   85,743 0 114,513
BAXTER INTL INC COM 071813109 46,325 575,964 SH   SOLE   416,753 0 159,211
BECTON DICKINSON & CO COM 075887109 955 3,884 SH   SOLE   1,816 0 2,068
BERKSHIRE HATHAWAY INC DEL CL A 084670108 2,880 7 SH   SOLE   7 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 6,550 23,998 SH   SOLE   7,840 0 16,158
BIOGEN INC COM 09062X103 290 1,025 SH   SOLE   750 0 275
BIO-TECHNE CORP COM 09073M104 321,092 662,634 SH   SOLE   523,422 0 139,212
BK OF AMERICA CORP COM 060505104 567 13,355 SH   SOLE   2,790 0 10,565
BLACK HILLS CORP COM 092113109 8,832 140,721 SH   SOLE   137,153 0 3,568
BLACKSTONE INC COM 09260D107 477 4,100 SH   SOLE   4,100 0 0
BOEING CO COM 097023105 775 3,525 SH   SOLE   3,025 0 500
BOSTON SCIENTIFIC CORP COM 101137107 207 4,768 SH   SOLE   4,768 0 0
BP PLC SPONSORED ADR 055622104 206 7,526 SH   SOLE   4,626 0 2,900
BRISTOL-MYERS SQUIBB CO COM 110122108 4,562 77,105 SH   SOLE   26,005 0 51,100
C H ROBINSON WORLDWIDE INC COM NEW 12541W209 113,886 1,309,032 SH   SOLE   1,006,569 0 302,463
CAMBIUM NETWORKS CORP SHS G17766109 3,493 96,514 SH   SOLE   96,514 0 0
CARDIOVASCULAR SYS INC DEL COM 141619106 5,485 167,060 SH   SOLE   167,060 0 0
CARRIER GLOBAL CORPORATION COM 14448C104 295 5,700 SH   SOLE   2,115 0 3,585
CASEYS GEN STORES INC COM 147528103 12,407 65,835 SH   SOLE   65,835 0 0
CATALENT INC COM 148806102 15,943 119,806 SH   SOLE   119,806 0 0
CATERPILLAR INC COM 149123101 1,310 6,822 SH   SOLE   1,611 0 5,211
CHEVRON CORP NEW COM 166764100 6,438 63,459 SH   SOLE   21,091 0 42,368
CINTAS CORP COM 172908105 1,507 3,959 SH   SOLE   1,593 0 2,366
CISCO SYS INC COM 17275R102 1,469 26,987 SH   SOLE   7,266 0 19,721
CMC MATERIALS INC COM 12571T100 13,807 112,041 SH   SOLE   112,041 0 0
COCA COLA CO COM 191216100 1,552 29,579 SH   SOLE   17,599 0 11,980
COMCAST CORP NEW CL A 20030N101 313 5,597 SH   SOLE   2,069 0 3,528
CONOCOPHILLIPS COM 20825C104 932 13,754 SH   SOLE   2,713 0 11,041
CORE LABORATORIES N V COM N22717107 252 9,085 SH   SOLE   835 0 8,250
CORESITE RLTY CORP COM 21870Q105 146,500 1,057,458 SH   SOLE   918,686 0 138,772
CORNING INC COM 219350105 62,674 1,717,562 SH   SOLE   1,368,857 0 348,705
COSTCO WHSL CORP NEW COM 22160K105 1,193 2,656 SH   SOLE   1,165 0 1,491
CSX CORP COM 126408103 572 19,242 SH   SOLE   1,530 0 17,712
CULLEN FROST BANKERS INC COM 229899109 18,020 151,912 SH   SOLE   130,724 0 21,188
CUMMINS INC COM 231021106 208 928 SH   SOLE   0 0 928
CYBEROPTICS CORP COM 232517102 2,839 79,806 SH   SOLE   79,806 0 0
DANAHER CORPORATION COM 235851102 280 921 SH   SOLE   640 0 281
DEERE & CO COM 244199105 306 913 SH   SOLE   132 0 781
DELUXE CORP COM 248019101 1,080 30,095 SH   SOLE   27,286 0 2,809
DIGI INTL INC COM 253798102 54,247 2,580,738 SH   SOLE   2,203,659 0 377,079
DISNEY WALT CO COM 254687106 170,146 1,005,768 SH   SOLE   770,810 0 234,958
DOMINION ENERGY INC COM 25746U109 338 4,632 SH   SOLE   1,250 0 3,382
DONALDSON INC COM 257651109 191,584 3,337,119 SH   SOLE   2,618,044 0 719,075
DUKE ENERGY CORP NEW COM NEW 26441C204 251 2,574 SH   SOLE   1,159 0 1,415
ECOLAB INC COM 278865100 381,326 1,827,848 SH   SOLE   1,486,576 0 341,272
ELANCO ANIMAL HEALTH INC COM 28414H103 36,494 1,144,356 SH   SOLE   877,027 0 267,329
EMERSON ELEC CO COM 291011104 12,524 132,956 SH   SOLE   63,572 0 69,384
ENERPAC TOOL GROUP CORP CL A COM 292765104 6,459 311,559 SH   SOLE   311,559 0 0
ENTERPRISE PRODS PARTNERS L COM 293792107 208 9,600 SH   SOLE   8,600 0 1,000
ENVESTNET INC COM 29404K106 7,863 97,996 SH   SOLE   97,996 0 0
EXELON CORP COM 30161N101 303 6,278 SH   SOLE   278 0 6,000
EXXON MOBIL CORP COM 30231G102 3,227 54,867 SH   SOLE   24,129 0 30,738
FACEBOOK INC CL A 30303M102 957 2,820 SH   SOLE   2,754 0 66
FASTENAL CO COM 311900104 175,582 3,402,094 SH   SOLE   2,610,550 0 791,544
FISERV INC COM 337738108 226,913 2,091,360 SH   SOLE   1,654,759 0 436,601
FLEETCOR TECHNOLOGIES INC COM 339041105 261 1,000 SH   SOLE   0 0 1,000
FORD MTR CO DEL COM 345370860 269 19,000 SH   SOLE   15,000 0 4,000
FULLER H B CO COM 359694106 174,863 2,708,536 SH   SOLE   2,323,489 0 385,047
GENERAC HLDGS INC COM 368736104 35,249 86,254 SH   SOLE   57,616 0 28,638
GENERAL ELECTRIC CO COM NEW 369604301 241 2,336 SH   SOLE   1,115 0 1,221
GENERAL MLS INC COM 370334104 21,324 356,475 SH   SOLE   159,861 0 196,614
GENTHERM INC COM 37253A103 39,302 485,634 SH   SOLE   416,545 0 69,089
GENUINE PARTS CO COM 372460105 236 1,950 SH   SOLE   1,700 0 250
GLACIER BANCORP INC NEW COM 37637Q105 14,858 268,432 SH   SOLE   268,432 0 0
GRACO INC COM 384109104 290,820 4,156,346 SH   SOLE   3,265,861 0 890,485
GREAT WESTERN BANCORP INC COM 391416104 21,278 649,898 SH   SOLE   610,690 0 39,208
HAWKINS INC COM 420261109 465 13,320 SH   SOLE   320 0 13,000
HERSHEY CO COM 427866108 12,970 76,635 SH   SOLE   72,650 0 3,985
HOME DEPOT INC COM 437076102 138,533 422,022 SH   SOLE   316,569 0 105,453
HONEYWELL INTL INC COM 438516106 155,912 734,465 SH   SOLE   466,636 0 267,829
HORMEL FOODS CORP COM 440452100 195,171 4,760,257 SH   SOLE   3,876,253 0 884,004
HUB GROUP INC CL A 443320106 7,396 107,576 SH   SOLE   107,576 0 0
HUNTINGTON BANCSHARES INC COM 446150104 435 28,117 SH   SOLE   18,050 0 10,067
HYLIION HOLDINGS CORP COMMON STOCK 449109107 1,246 148,367 SH   SOLE   148,367 0 0
IDEXX LABS INC COM 45168D104 2,117 3,404 SH   SOLE   448 0 2,956
ILLINOIS TOOL WKS INC COM 452308109 372 1,799 SH   SOLE   1,400 0 399
INSPIRE MED SYS INC COM 457730109 40,103 172,203 SH   SOLE   169,754 0 2,449
INTEL CORP COM 458140100 11,609 217,878 SH   SOLE   83,390 0 134,488
INTERNATIONAL BUSINESS MACHS COM 459200101 741 5,335 SH   SOLE   2,088 0 3,247
INTRICON CORP COM 46121H109 7,085 390,164 SH   SOLE   390,164 0 0
INVESCO QQQ TR UNIT SER 1 46090E103 449 1,255 SH   SOLE   1,020 0 235
IPG PHOTONICS CORP COM 44980X109 238 1,500 SH   SOLE   0 0 1,500
ISHARES TR CORE S&P500 ETF 464287200 1,704 3,955 SH   SOLE   1,112 0 2,843
ISHARES TR GLOBAL TECH ETF 464287291 209 3,684 SH   SOLE   3,684 0 0
ISHARES TR MSCI EAFE ETF 464287465 241 3,092 SH   SOLE   2,100 0 992
ISHARES TR RUS MID CAP ETF 464287499 262 3,348 SH   SOLE   2,948 0 400
JAMF HLDG CORP COM 47074L105 58,879 1,528,526 SH   SOLE   1,347,838 0 180,688
JOHNSON & JOHNSON COM 478160104 249,896 1,547,344 SH   SOLE   1,194,200 0 353,144
JPMORGAN CHASE & CO COM 46625H100 36,349 222,062 SH   SOLE   151,522 0 70,540
KIMBERLY-CLARK CORP COM 494368103 4,486 33,875 SH   SOLE   13,236 0 20,639
LILLY ELI & CO COM 532457108 153,233 663,205 SH   SOLE   497,810 0 165,395
LITTELFUSE INC COM 537008104 211,468 773,841 SH   SOLE   657,582 0 116,259
LOWES COS INC COM 548661107 1,468 7,235 SH   SOLE   3,442 0 3,793
MARCUS CORP DEL COM 566330106 9,807 562,031 SH   SOLE   562,031 0 0
MASTERCARD INCORPORATED CL A 57636Q104 500 1,438 SH   SOLE   100 0 1,338
MCCORMICK & CO INC COM NON VTG 579780206 219 2,700 SH   SOLE   2,700 0 0
MCDONALDS CORP COM 580135101 3,531 14,647 SH   SOLE   11,421 0 3,226
MDU RES GROUP INC COM 552690109 235 7,933 SH   SOLE   3,733 0 4,200
MEDTRONIC PLC SHS G5960L103 342,968 2,736,081 SH   SOLE   2,231,347 0 504,734
MERCK & CO INC COM 58933Y105 4,809 64,028 SH   SOLE   29,014 0 35,014
MGP INGREDIENTS INC NEW COM 55303J106 4,730 72,661 SH   SOLE   72,661 0 0
MICROSOFT CORP COM 594918104 587,389 2,083,530 SH   SOLE   1,816,312 0 267,218
MICROVAST HOLDINGS INC COM 59516C106 576 70,100 SH   SOLE   70,100 0 0
MONDELEZ INTL INC CL A 609207105 260 4,471 SH   SOLE   3,385 0 1,086
MOTOROLA SOLUTIONS INC COM NEW 620076307 189,509 815,724 SH   SOLE   705,505 0 110,219
NEXTERA ENERGY INC COM 65339F101 227 2,888 SH   SOLE   1,688 0 1,200
NIKE INC CL B 654106103 586 4,037 SH   SOLE   4,037 0 0
NORFOLK SOUTHN CORP COM 655844108 1,046 4,373 SH   SOLE   1,062 0 3,311
NORTHWESTERN CORP COM NEW 668074305 8,087 141,133 SH   SOLE   137,154 0 3,979
NUVEEN MINN QUALITY MUN INM SHS 670734102 499 31,200 SH   SOLE   0 0 31,200
NVE CORP COM NEW 629445206 1,183 18,494 SH   SOLE   7,113 0 11,381
NVENT ELECTRIC PLC SHS G6700G107 124,724 3,857,826 SH   SOLE   3,299,700 0 558,126
NVIDIA CORPORATION COM 67066G104 276,449 1,334,471 SH   SOLE   1,154,069 0 180,402
OLD NATL BANCORP IND COM 680033107 42,730 2,520,934 SH   SOLE   2,213,146 0 307,788
ORACLE CORP COM 68389X105 2,274 26,096 SH   SOLE   3,986 0 22,110
OSHKOSH CORP COM 688239201 14,636 142,975 SH   SOLE   142,975 0 0
OTIS WORLDWIDE CORP COM 68902V107 229 2,784 SH   SOLE   634 0 2,150
PATTERSON COS INC COM 703395103 4,689 155,565 SH   SOLE   146,935 0 8,630
PAYCHEX INC COM 704326107 307 2,730 SH   SOLE   1,742 0 988
PENTAIR PLC SHS G7S00T104 14,842 204,355 SH   SOLE   103,859 0 100,496
PEPSICO INC COM 713448108 1,820 12,100 SH   SOLE   6,701 0 5,399
PFIZER INC COM 717081103 70,349 1,635,633 SH   SOLE   1,170,711 0 464,922
PHILIP MORRIS INTL INC COM 718172109 457 4,823 SH   SOLE   1,698 0 3,125
PHILLIPS 66 COM 718546104 413 5,901 SH   SOLE   3,419 0 2,482
PHYSICIANS RLTY TR COM 71943U104 9,969 565,804 SH   SOLE   537,404 0 28,400
PLEXUS CORP COM 729132100 8,466 94,685 SH   SOLE   94,685 0 0
PLUG POWER INC COM NEW 72919P202 255 10,000 SH   SOLE   10,000 0 0
POLARIS INC COM 731068102 31,646 264,467 SH   SOLE   232,341 0 32,126
PRINCIPAL FINANCIAL GROUP IN COM 74251V102 107,118 1,663,323 SH   SOLE   1,270,524 0 392,799
PROCTER AND GAMBLE CO COM 742718109 26,052 186,350 SH   SOLE   87,988 0 98,362
PROTO LABS INC COM 743713109 12,228 183,598 SH   SOLE   137,661 0 45,937
PURE CYCLE CORP COM NEW 746228303 158 11,855 SH   SOLE   0 0 11,855
QCR HOLDINGS INC COM 74727A104 7,610 147,945 SH   SOLE   147,945 0 0
QUALCOMM INC COM 747525103 145,997 1,131,938 SH   SOLE   946,900 0 185,038
RAYTHEON TECHNOLOGIES CORP COM 75513E101 849 9,876 SH   SOLE   2,474 0 7,402
REATA PHARMACEUTICALS INC CL A 75615P103 201 2,000 SH   SOLE   0 0 2,000
ROCKWELL AUTOMATION INC COM 773903109 43,867 149,187 SH   SOLE   144,882 0 4,305
SCHWAB CHARLES CORP COM 808513105 115,941 1,591,721 SH   SOLE   1,348,088 0 243,633
SCHWAB STRATEGIC TR INTL EQTY ETF 808524805 1,664 43,000 SH   SOLE   3,000 0 40,000
SCHWAB STRATEGIC TR US BRD MKT ETF 808524102 4,712 45,370 SH   SOLE   15,510 0 29,860
SELECT SECTOR SPDR TR TECHNOLOGY 81369Y803 515 3,452 SH   SOLE   1,052 0 2,400
SHERWIN WILLIAMS CO COM 824348106 156,151 558,222 SH   SOLE   506,961 0 51,261
SHYFT GROUP INC COM 825698103 502 13,200 SH   SOLE   0 0 13,200
SKYWATER TECHNOLOGY INC COM 83089J108 3,766 138,465 SH   SOLE   138,465 0 0
SLEEP NUMBER CORP COM 83125X103 30,668 328,069 SH   SOLE   321,401 0 6,668
SNAP ON INC COM 833034101 2,233 10,685 SH   SOLE   6,080 0 4,605
SONY GROUP CORPORATION SPONSORED ADR 835699307 235 2,125 SH   SOLE   470 0 1,655
SOUTHERN CO COM 842587107 258 4,158 SH   SOLE   1,400 0 2,758
SPDR S&P 500 ETF TR TR UNIT 78462F103 6,370 14,843 SH   SOLE   12,120 0 2,723
SQUARE INC CL A 852234103 240 1,000 SH   SOLE   1,000 0 0
STARBUCKS CORP COM 855244109 938 8,499 SH   SOLE   8,249 0 250
SURMODICS INC COM 868873100 3,365 60,520 SH   SOLE   60,520 0 0
SYSCO CORP COM 871829107 74,652 950,978 SH   SOLE   843,048 0 107,930
TARGET CORP COM 87612E106 128,382 561,185 SH   SOLE   390,434 0 170,751
TENNANT CO COM 880345103 124,025 1,677,146 SH   SOLE   1,475,612 0 201,534
TESLA INC COM 88160R101 402 518 SH   SOLE   18 0 500
TEXAS INSTRS INC COM 882508104 14,041 73,050 SH   SOLE   64,355 0 8,695
THERMO FISHER SCIENTIFIC INC COM 883556102 657 1,150 SH   SOLE   0 0 1,150
TORO CO COM 891092108 253,934 2,606,863 SH   SOLE   2,126,224 0 480,639
TRANE TECHNOLOGIES PLC SHS G8994E103 204 1,179 SH   SOLE   819 0 360
TRAVELERS COMPANIES INC COM 89417E109 15,411 101,384 SH   SOLE   50,829 0 50,555
UNION PAC CORP COM 907818108 1,652 8,427 SH   SOLE   2,818 0 5,609
UNITED PARCEL SERVICE INC CL B 911312106 45,477 249,738 SH   SOLE   126,503 0 123,235
UNITEDHEALTH GROUP INC COM 91324P102 363,685 930,760 SH   SOLE   810,932 0 119,828
US BANCORP DEL COM NEW 902973304 387,568 6,520,325 SH   SOLE   5,357,494 0 1,162,830
VANGUARD INDEX FDS GROWTH ETF 922908736 233 803 SH   SOLE   803 0 0
VANGUARD INDEX FDS TOTAL STK MKT 922908769 556 2,504 SH   SOLE   1,045 0 1,459
VANGUARD SPECIALIZED FUNDS DIV APP ETF 921908844 429 2,791 SH   SOLE   2,659 0 132
VANGUARD WORLD FDS INF TECH ETF 92204A702 313 780 SH   SOLE   50 0 730
VERICEL CORP COM 92346J108 1,327 27,200 SH   SOLE   27,200 0 0
VERIZON COMMUNICATIONS INC COM 92343V104 5,098 94,381 SH   SOLE   25,096 0 69,285
VISA INC COM CL A 92826C839 235,522 1,057,340 SH   SOLE   906,539 0 150,801
WALGREENS BOOTS ALLIANCE INC COM 931427108 340 7,225 SH   SOLE   1,225 0 6,000
WALMART INC COM 931142103 732 5,251 SH   SOLE   3,566 0 1,685
WEC ENERGY GROUP INC COM 92939U106 646 7,319 SH   SOLE   4,353 0 2,966
WELLS FARGO CO NEW COM 949746101 170,869 3,681,737 SH   SOLE   3,039,564 0 642,173
WEYERHAEUSER CO MTN BE COM NEW 962166104 802 22,550 SH   SOLE   11,648 0 10,902
WINTRUST FINL CORP COM 97650W108 18,882 234,941 SH   SOLE   234,941 0 0
WORKIVA INC COM CL A 98139A105 58,989 418,481 SH   SOLE   397,909 0 20,572
XCEL ENERGY INC COM 98389B100 17,653 282,443 SH   SOLE   180,914 0 101,529
XYLEM INC COM 98419M100 200 1,620 SH   SOLE   1,100 0 520
ZIMMER BIOMET HOLDINGS INC COM 98956P102 31,006 211,847 SH   SOLE   89,896 0 121,951
ZOETIS INC CL A 98978V103 314 1,617 SH   SOLE   1,617 0 0