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 239,705 1,496,471 SH   SOLE   1,061,179 0 435,292
AAR CORP COM 000361105 5,349 284,535 SH   SOLE   284,535 0 0
ABBOTT LABS COM 002824100 161,384 1,482,904 SH   SOLE   1,002,386 0 480,518
ABBVIE INC COM 00287Y109 5,968 68,138 SH   SOLE   18,619 0 49,519
ACCENTURE PLC IRELAND SHS CLASS A G1151C101 296 1,310 SH   SOLE   764 0 546
ACTIVISION BLIZZARD INC COM 00507V109 60,281 744,665 SH   SOLE   678,859 0 65,806
ADOBE SYSTEMS INCORPORATED COM 00724F101 894 1,823 SH   SOLE   523 0 1,300
ALLETE INC COM NEW 018522300 1,836 35,483 SH   SOLE   13,805 0 21,678
ALLIANT ENERGY CORP COM 018802108 11,617 224,924 SH   SOLE   210,498 0 14,426
ALPHABET INC CAP STK CL A 02079K305 2,171 1,481 SH   SOLE   1,177 0 304
ALPHABET INC CAP STK CL C 02079K107 412,570 280,736 SH   SOLE   239,689 0 41,047
AMAZON COM INC COM 023135106 1,924 611 SH   SOLE   221 0 390
AMCOR PLC ORD G0250X107 7,680 695,048 SH   SOLE   329,333 0 365,715
AMERICAN EXPRESS CO COM 025816109 126,142 1,258,275 SH   SOLE   1,015,513 0 242,762
AMERICAN TOWER CORP NEW COM 03027X100 760 3,145 SH   SOLE   0 0 3,145
AMERIPRISE FINL INC COM 03076C106 364 2,362 SH   SOLE   1,620 0 742
AMETEK INC COM 031100100 268 2,700 SH   SOLE   2,700 0 0
AMGEN INC COM 031162100 2,149 8,455 SH   SOLE   5,734 0 2,721
ANSYS INC COM 03662Q105 291 890 SH   SOLE   0 0 890
APOGEE ENTERPRISES INC COM 037598109 6,375 298,335 SH   SOLE   298,235 0 100
APPLE INC COM 037833100 16,315 140,874 SH   SOLE   68,668 0 72,206
APPLIED MATLS INC COM 038222105 337 5,677 SH   SOLE   0 0 5,677
ASSOCIATED BANC CORP COM 045487105 8,280 656,076 SH   SOLE   601,866 0 54,210
AT&T INC COM 00206R102 1,034 36,280 SH   SOLE   12,136 0 24,144
AUTOMATIC DATA PROCESSING IN COM 053015103 665 4,764 SH   SOLE   3,664 0 1,100
AXOGEN INC COM 05463X106 256 22,000 SH   SOLE   22,000 0 0
BADGER METER INC COM 056525108 18,383 281,217 SH   SOLE   139,206 0 142,011
BAXTER INTL INC COM 071813109 48,451 602,470 SH   SOLE   419,040 0 183,430
BECTON DICKINSON & CO COM 075887109 1,046 4,494 SH   SOLE   2,376 0 2,118
BERKSHIRE HATHAWAY INC DEL CL A 084670108 2,240 7 SH   SOLE   7 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 5,410 25,407 SH   SOLE   8,556 0 16,851
BIOGEN INC COM 09062X103 291 1,025 SH   SOLE   750 0 275
BIO-TECHNE CORP COM 09073M104 211,904 855,383 SH   SOLE   676,722 0 178,661
BK OF AMERICA CORP COM 060505104 286 11,879 SH   SOLE   1,314 0 10,565
BLACK HILLS CORP COM 092113109 9,175 171,525 SH   SOLE   171,525 0 0
BLACKSTONE GROUP INC COM CL A 09260D107 287 5,500 SH   SOLE   5,500 0 0
BOEING CO COM 097023105 577 3,492 SH   SOLE   2,677 0 815
BP PLC SPONSORED ADR 055622104 312 17,852 SH   SOLE   10,038 0 7,814
BRISTOL-MYERS SQUIBB CO COM 110122108 6,505 107,900 SH   SOLE   46,405 0 61,495
C H ROBINSON WORLDWIDE INC COM NEW 12541W209 135,228 1,323,296 SH   SOLE   982,807 0 340,489
CABOT MICROELECTRONICS CORP COM 12709P103 11,286 79,025 SH   SOLE   79,025 0 0
CALYXT INC COM 13173L107 1,216 221,495 SH   SOLE   221,495 0 0
CARDIOVASCULAR SYS INC DEL COM 141619106 5,006 127,205 SH   SOLE   127,205 0 0
CARRIER GLOBAL CORPORATION COM 14448C104 262 8,592 SH   SOLE   3,532 0 5,060
CASEYS GEN STORES INC COM 147528103 9,745 54,855 SH   SOLE   54,855 0 0
CATALENT INC COM 148806102 12,510 146,038 SH   SOLE   145,435 0 603
CATERPILLAR INC DEL COM 149123101 1,030 6,907 SH   SOLE   1,479 0 5,428
CHEVRON CORP NEW COM 166764100 13,441 186,677 SH   SOLE   112,715 0 73,962
CINTAS CORP COM 172908105 1,334 4,009 SH   SOLE   1,575 0 2,434
CISCO SYS INC COM 17275R102 1,355 34,400 SH   SOLE   13,674 0 20,726
COCA COLA CO COM 191216100 1,374 27,829 SH   SOLE   14,337 0 13,492
COLGATE PALMOLIVE CO COM 194162103 201 2,600 SH   SOLE   2,600 0 0
COMCAST CORP NEW CL A 20030N101 383 8,282 SH   SOLE   4,754 0 3,528
CONOCOPHILLIPS COM 20825C104 2,170 66,073 SH   SOLE   20,083 0 45,990
CORE LABORATORIES N V COM N22717107 4,188 274,442 SH   SOLE   194,637 0 79,805
CORESITE RLTY CORP COM 21870Q105 149,992 1,261,708 SH   SOLE   1,110,838 0 150,870
CORNING INC COM 219350105 65,696 2,027,019 SH   SOLE   1,640,477 0 386,542
COSTCO WHSL CORP NEW COM 22160K105 1,190 3,352 SH   SOLE   1,280 0 2,072
CSX CORP COM 126408103 560 7,210 SH   SOLE   510 0 6,700
CULLEN FROST BANKERS INC COM 229899109 15,101 236,140 SH   SOLE   189,755 0 46,385
CUMMINS INC COM 231021106 208 983 SH   SOLE   0 0 983
CYBEROPTICS CORP COM 232517102 2,220 69,719 SH   SOLE   69,719 0 0
DANAHER CORPORATION COM 235851102 209 971 SH   SOLE   640 0 331
DEERE & CO COM 244199105 221 997 SH   SOLE   112 0 885
DELUXE CORP COM 248019101 861 33,459 SH   SOLE   28,975 0 4,484
DIGI INTL INC COM 253798102 42,265 2,704,121 SH   SOLE   2,332,402 0 371,719
DISNEY WALT CO COM DISNEY 254687106 197,789 1,594,047 SH   SOLE   1,299,679 0 294,368
DOMINION ENERGY INC COM 25746U109 369 4,674 SH   SOLE   1,292 0 3,382
DONALDSON INC COM 257651109 166,150 3,579,271 SH   SOLE   2,742,363 0 836,908
DUKE ENERGY CORP NEW COM NEW 26441C204 215 2,424 SH   SOLE   1,159 0 1,265
ECOLAB INC COM 278865100 318,844 1,595,498 SH   SOLE   1,247,825 0 347,673
ELANCO ANIMAL HEALTH INC COM 28414H103 35,574 1,273,674 SH   SOLE   976,721 0 296,953
EMERSON ELEC CO COM 291011104 15,646 238,613 SH   SOLE   104,828 0 133,785
ENERPAC TOOL GROUP CORP CL A COM 292765104 6,764 359,578 SH   SOLE   359,578 0 0
ENVESTNET INC COM 29404K106 2,261 29,300 SH   SOLE   29,300 0 0
EXELON CORP COM 30161N101 225 6,278 SH   SOLE   278 0 6,000
EXXON MOBIL CORP COM 30231G102 4,538 132,186 SH   SOLE   46,944 0 85,242
FACEBOOK INC CL A 30303M102 750 2,865 SH   SOLE   2,799 0 66
FASTENAL CO COM 311900104 164,477 3,647,753 SH   SOLE   2,703,975 0 943,778
FISERV INC COM 337738108 197,492 1,916,465 SH   SOLE   1,492,427 0 424,038
FLEETCOR TECHNOLOGIES INC COM 339041105 238 1,000 SH   SOLE   0 0 1,000
FULLER H B CO COM 359694106 134,155 2,930,436 SH   SOLE   2,526,232 0 404,204
GENERAC HLDGS INC COM 368736104 21,150 109,224 SH   SOLE   78,618 0 30,606
GENERAL ELECTRIC CO COM 369604103 470 75,494 SH   SOLE   21,315 0 54,179
GENERAL MLS INC COM 370334104 59,927 971,575 SH   SOLE   533,199 0 438,376
GENTHERM INC COM 37253A103 20,062 490,511 SH   SOLE   459,403 0 31,108
GLACIER BANCORP INC NEW COM 37637Q105 8,959 279,535 SH   SOLE   279,165 0 370
GRACO INC COM 384109104 272,524 4,442,113 SH   SOLE   3,399,943 0 1,042,170
GREAT WESTN BANCORP INC COM 391416104 23,247 1,867,226 SH   SOLE   1,757,821 0 109,405
HAWKINS INC COM 420261109 300 6,500 SH   SOLE   0 0 6,500
HERSHEY CO COM 427866108 9,616 67,085 SH   SOLE   64,960 0 2,125
HOME DEPOT INC COM 437076102 113,090 407,223 SH   SOLE   302,780 0 104,443
HONEYWELL INTL INC COM 438516106 176,642 1,073,093 SH   SOLE   746,548 0 326,545
HORMEL FOODS CORP COM 440452100 203,011 4,152,411 SH   SOLE   3,258,788 0 893,623
HUB GROUP INC CL A 443320106 5,297 105,525 SH   SOLE   105,525 0 0
IDEXX LABS INC COM 45168D104 1,343 3,417 SH   SOLE   448 0 2,969
ILLINOIS TOOL WKS INC COM 452308109 357 1,849 SH   SOLE   1,450 0 399
INSPIRE MED SYS INC COM 457730109 10,670 82,685 SH   SOLE   81,460 0 1,225
INTEL CORP COM 458140100 18,468 356,664 SH   SOLE   141,398 0 215,266
INTERNATIONAL BUSINESS MACHS COM 459200101 1,033 8,492 SH   SOLE   2,459 0 6,033
INTRICON CORP COM 46121H109 5,078 416,909 SH   SOLE   416,909 0 0
INVESCO QQQ TR UNIT SER 1 46090E103 354 1,275 SH   SOLE   1,020 0 255
IPG PHOTONICS CORP COM 44980X109 255 1,500 SH   SOLE   0 0 1,500
ISHARES TR CORE S&P500 ETF 464287200 1,095 3,258 SH   SOLE   415 0 2,843
ISHARES TR MSCI EAFE ETF 464287465 419 6,579 SH   SOLE   5,247 0 1,332
ISHARES TR S&P SML 600 GWT 464287887 292 1,655 SH   SOLE   1,655 0 0
JAMF HLDG CORP COM 47074L105 36,645 974,332 SH   SOLE   890,948 0 83,384
JOHNSON & JOHNSON COM 478160104 235,539 1,582,071 SH   SOLE   1,208,994 0 373,077
JPMORGAN CHASE & CO COM 46625H100 23,035 239,276 SH   SOLE   165,616 0 73,660
KIMBERLY CLARK CORP COM 494368103 8,512 57,648 SH   SOLE   20,539 0 37,109
LILLY ELI & CO COM 532457108 101,714 687,164 SH   SOLE   504,076 0 183,088
LITTELFUSE INC COM 537008104 115,428 650,883 SH   SOLE   552,736 0 98,147
LOWES COS INC COM 548661107 1,195 7,203 SH   SOLE   3,285 0 3,918
MARCUS CORP DEL COM 566330106 2,865 370,578 SH   SOLE   370,578 0 0
MASTERCARD INCORPORATED CL A 57636Q104 933 2,759 SH   SOLE   114 0 2,645
MCCORMICK & CO INC COM NON VTG 579780206 262 1,350 SH   SOLE   1,350 0 0
MCDONALDS CORP COM 580135101 3,330 15,173 SH   SOLE   12,259 0 2,914
MDU RES GROUP INC COM 552690109 928 41,258 SH   SOLE   16,083 0 25,175
MEDTRONIC PLC SHS G5960L103 300,471 2,891,372 SH   SOLE   2,341,279 0 550,093
MERCK & CO. INC COM 58933Y105 6,563 79,115 SH   SOLE   35,217 0 43,898
MGP INGREDIENTS INC NEW COM 55303J106 4,029 101,375 SH   SOLE   101,375 0 0
MICROSOFT CORP COM 594918104 426,728 2,028,850 SH   SOLE   1,770,515 0 258,335
MOTOROLA SOLUTIONS INC COM NEW 620076307 121,540 775,075 SH   SOLE   683,917 0 91,158
MTS SYS CORP COM 553777103 585 30,625 SH   SOLE   9,700 0 20,925
NEXTERA ENERGY INC COM 65339F101 508 1,830 SH   SOLE   646 0 1,184
NIKE INC CL B 654106103 512 4,082 SH   SOLE   4,082 0 0
NORFOLK SOUTHN CORP COM 655844108 826 3,860 SH   SOLE   285 0 3,575
NORTHWESTERN CORP COM NEW 668074305 6,455 132,710 SH   SOLE   132,710 0 0
NOVARTIS AG SPONSORED ADR 66987V109 246 2,830 SH   SOLE   500 0 2,330
NUVEEN MINN QUALITY MUN INM SHS 670734102 522 37,002 SH   SOLE   5,802 0 31,200
NVE CORP COM NEW 629445206 22,064 449,548 SH   SOLE   392,610 0 56,938
NVENT ELECTRIC PLC SHS G6700G107 79,002 4,465,892 SH   SOLE   3,881,772 0 584,120
NVIDIA CORPORATION COM 67066G104 237,074 438,037 SH   SOLE   390,488 0 47,549
OLD NATL BANCORP IND COM 680033107 43,373 3,453,254 SH   SOLE   2,937,602 0 515,652
ORACLE CORP COM 68389X105 1,608 26,936 SH   SOLE   4,771 0 22,165
OSHKOSH CORP COM 688239201 10,954 149,035 SH   SOLE   149,035 0 0
OTIS WORLDWIDE CORP COM 68902V107 277 4,432 SH   SOLE   1,687 0 2,745
PATTERSON COS INC COM 703395103 4,971 206,226 SH   SOLE   184,749 0 21,477
PAYCHEX INC COM 704326107 218 2,730 SH   SOLE   1,742 0 988
PENTAIR PLC SHS G7S00T104 17,384 379,811 SH   SOLE   172,171 0 207,640
PEPSICO INC COM 713448108 1,822 13,146 SH   SOLE   5,904 0 7,242
PFIZER INC COM 717081103 83,259 2,268,642 SH   SOLE   1,699,096 0 569,546
PHILIP MORRIS INTL INC COM 718172109 362 4,823 SH   SOLE   1,698 0 3,125
PHILLIPS 66 COM 718546104 948 18,286 SH   SOLE   8,941 0 9,345
PHYSICIANS RLTY TR COM 71943U104 9,576 534,665 SH   SOLE   515,365 0 19,300
PLEXUS CORP COM 729132100 3,366 47,650 SH   SOLE   47,650 0 0
PLUG POWER INC COM NEW 72919P202 280 20,875 SH   SOLE   20,000 0 875
POLYMET MNG CORP COM NEW 731916409 434 119,016 SH   SOLE   119,016 0 0
PRINCIPAL FINANCIAL GROUP IN COM 74251V102 146,732 3,643,693 SH   SOLE   3,078,875 0 564,818
PROCTER AND GAMBLE CO COM 742718109 25,372 182,545 SH   SOLE   75,308 0 107,237
PROTO LABS INC COM 743713109 26,342 203,415 SH   SOLE   163,199 0 40,216
PURECYCLE CORP COM NEW 746228303 107 11,855 SH   SOLE   0 0 11,855
QCR HOLDINGS INC COM 74727A104 4,062 148,200 SH   SOLE   148,200 0 0
QUALCOMM INC COM 747525103 117,430 997,872 SH   SOLE   845,406 0 152,466
RAVEN INDS INC COM 754212108 2,728 126,766 SH   SOLE   126,266 0 500
RAYTHEON TECHNOLOGIES CORP COM 75513E101 745 12,948 SH   SOLE   4,731 0 8,217
ROCKWELL AUTOMATION INC COM 773903109 34,803 157,707 SH   SOLE   153,718 0 3,989
SCHLUMBERGER LTD COM 806857108 3,625 232,940 SH   SOLE   84,984 0 147,956
SCHWAB CHARLES CORP COM 808513105 48,139 1,328,710 SH   SOLE   1,067,550 0 261,160
SCHWAB STRATEGIC TR INTL EQTY ETF 808524805 1,388 44,190 SH   SOLE   0 0 44,190
SCHWAB STRATEGIC TR US BRD MKT ETF 808524102 3,613 45,370 SH   SOLE   15,510 0 29,860
SELECT SECTOR SPDR TR TECHNOLOGY 81369Y803 403 3,452 SH   SOLE   1,052 0 2,400
SHERWIN WILLIAMS CO COM 824348106 60,479 86,803 SH   SOLE   75,672 0 11,131
SLEEP NUMBER CORP COM 83125X103 4,953 101,262 SH   SOLE   101,262 0 0
SNAP ON INC COM 833034101 5,834 39,650 SH   SOLE   15,605 0 24,045
SOUTHERN CO COM 842587107 237 4,373 SH   SOLE   1,400 0 2,973
SPDR S&P 500 ETF TR TR UNIT 78462F103 3,879 11,582 SH   SOLE   8,491 0 3,091
SPDR S&P MIDCAP 400 ETF TR UTSER1 S&PDCRP 78467Y107 264 779 SH   SOLE   584 0 195
STARBUCKS CORP COM 855244109 824 9,595 SH   SOLE   9,345 0 250
SURMODICS INC COM 868873100 1,720 44,198 SH   SOLE   44,198 0 0
SYSCO CORP COM 871829107 56,034 900,572 SH   SOLE   810,272 0 90,300
TARGET CORP COM 87612E106 96,824 615,071 SH   SOLE   409,192 0 205,879
TCF FINL CORP COM 872307103 319 13,671 SH   SOLE   5,854 0 7,817
TENNANT CO COM 880345103 95,235 1,577,776 SH   SOLE   1,381,159 0 196,617
TESLA INC COM 88160R101 215 500 SH   SOLE   0 0 500
TEXAS INSTRS INC COM 882508104 2,779 19,460 SH   SOLE   18,510 0 950
THERMO FISHER SCIENTIFIC INC COM 883556102 596 1,350 SH   SOLE   200 0 1,150
TORO CO COM 891092108 229,975 2,739,422 SH   SOLE   2,223,446 0 515,976
TORTOISE ACQUISITION CORP CL A 89154L100 997 20,000 SH   SOLE   20,000 0 0
TRAVELERS COMPANIES INC COM 89417E109 16,186 149,609 SH   SOLE   70,438 0 79,171
UNION PAC CORP COM 907818108 1,812 9,202 SH   SOLE   3,468 0 5,734
UNITED FIRE GROUP INC COM 910340108 2,989 147,113 SH   SOLE   147,113 0 0
UNITED PARCEL SERVICE INC CL B 911312106 51,274 307,709 SH   SOLE   139,568 0 168,141
UNITEDHEALTH GROUP INC COM 91324P102 236,862 759,733 SH   SOLE   656,074 0 103,659
US BANCORP DEL COM NEW 902973304 280,723 7,830,487 SH   SOLE   6,512,401 0 1,318,086
VANGUARD SPECIALIZED FUNDS DIV APP ETF 921908844 412 3,204 SH   SOLE   3,204 0 0
VERICEL CORP COM 92346J108 389 21,000 SH   SOLE   21,000 0 0
VERIZON COMMUNICATIONS INC COM 92343V104 6,525 109,687 SH   SOLE   28,130 0 81,557
VISA INC COM CL A 92826C839 189,153 945,907 SH   SOLE   816,974 0 128,933
WALGREENS BOOTS ALLIANCE INC COM 931427108 289 8,050 SH   SOLE   2,050 0 6,000
WALMART INC COM 931142103 672 4,804 SH   SOLE   3,358 0 1,446
WEC ENERGY GROUP INC COM 92939U106 709 7,319 SH   SOLE   1,478 0 5,841
WELLS FARGO CO NEW COM 949746101 95,949 4,081,214 SH   SOLE   3,483,868 0 597,346
WEYERHAEUSER CO MTN BE COM NEW 962166104 637 22,324 SH   SOLE   11,648 0 10,676
WINTRUST FINL CORP COM 97650W108 11,718 292,595 SH   SOLE   292,595 0 0
WORKIVA INC COM CL A 98139A105 27,982 501,833 SH   SOLE   470,183 0 31,650
XCEL ENERGY INC COM 98389B100 16,143 233,918 SH   SOLE   133,207 0 100,711
ZIMMER BIOMET HOLDINGS INC COM 98956P102 114,632 842,014 SH   SOLE   655,800 0 186,214
ZOETIS INC CL A 98978V103 693 4,189 SH   SOLE   2,249 0 1,940