The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete. | |||||||||||||||||
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 13F FORM 13F INFORMATION TABLE |
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| 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 Company | COM | 88579y101 | 24,846 | 113,183 | SH | SOLE | 0 | 0 | 113,183 | ||
| A T & T Inc New | COM | 00206r102 | 395 | 11,068 | SH | SOLE | 0 | 0 | 11,068 | ||
| Abbott Labs | COM | 002824100 | 856 | 14,290 | SH | SOLE | 0 | 0 | 14,290 | ||
| Abbvie Inc. Com | COM | 00287y109 | 1,756 | 18,548 | SH | SOLE | 0 | 0 | 18,548 | ||
| Alphabet Inc Cap Stk Cl A | COM | 02079k305 | 339 | 327 | SH | SOLE | 0 | 0 | 327 | ||
| Amazon.Com Inc | COM | 023135106 | 958 | 662 | SH | SOLE | 0 | 0 | 662 | ||
| Apple Computer | COM | 037833100 | 8,865 | 52,838 | SH | SOLE | 0 | 0 | 52,838 | ||
| Auto Data Processing | COM | 053015103 | 24,331 | 214,406 | SH | SOLE | 0 | 0 | 214,406 | ||
| Becton Dickinson | COM | 075887109 | 15,542 | 71,722 | SH | SOLE | 0 | 0 | 71,722 | ||
| Bellicum Pharmaceutica | COM | 079481107 | 91 | 13,900 | SH | SOLE | 0 | 0 | 13,900 | ||
| Berkshire Hathaway Cl B | COM | 084670702 | 473 | 2,372 | SH | SOLE | 0 | 0 | 2,372 | ||
| Black Box Corp Del Com | COM | 091826107 | 20 | 10,000 | SH | SOLE | 0 | 0 | 10,000 | ||
| Black Stone Minerals L Com Uni | COM | 09225m101 | 1,175 | 70,998 | SH | SOLE | 0 | 0 | 70,998 | ||
| Bristol Myers Squibb | COM | 110122108 | 345 | 5,450 | SH | SOLE | 0 | 0 | 5,450 | ||
| CVS Health | COM | 126650100 | 8,691 | 139,697 | SH | SOLE | 0 | 0 | 139,697 | ||
| Chevron Corp | COM | 166764100 | 2,497 | 21,894 | SH | SOLE | 0 | 0 | 21,894 | ||
| Clorox Co Del | COM | 189054109 | 228 | 1,710 | SH | SOLE | 0 | 0 | 1,710 | ||
| Coca-Cola | COM | 191216100 | 17,359 | 399,700 | SH | SOLE | 0 | 0 | 399,700 | ||
| Colgate Palmolive | COM | 194162103 | 306 | 4,268 | SH | SOLE | 0 | 0 | 4,268 | ||
| Dominion Energy Inc | COM | 25746U109 | 788 | 11,680 | SH | SOLE | 0 | 0 | 11,680 | ||
| Donaldson | COM | 257651109 | 23,939 | 531,377 | SH | SOLE | 0 | 0 | 531,377 | ||
| Dorchester Minerals LP | COM | 25820R105 | 1,176 | 73,023 | SH | SOLE | 0 | 0 | 73,023 | ||
| Dover | COM | 260003108 | 21,371 | 217,581 | SH | SOLE | 0 | 0 | 217,581 | ||
| Dow Dupont Inc Com | COM | 26078j100 | 394 | 6,188 | SH | SOLE | 0 | 0 | 6,188 | ||
| Ecolab | COM | 278865100 | 23,976 | 174,919 | SH | SOLE | 0 | 0 | 174,919 | ||
| Emerson Electric | COM | 291011104 | 18,686 | 273,582 | SH | SOLE | 0 | 0 | 273,582 | ||
| Exxon Mobil Corp | COM | 30231g102 | 3,725 | 49,927 | SH | SOLE | 0 | 0 | 49,927 | ||
| FedEx | COM | 31428x106 | 26,615 | 110,845 | SH | SOLE | 0 | 0 | 110,845 | ||
| Home Depot Inc | COM | 437076102 | 290 | 1,628 | SH | SOLE | 0 | 0 | 1,628 | ||
| Honeywell International | COM | 438516106 | 18,223 | 126,099 | SH | SOLE | 0 | 0 | 126,099 | ||
| Illinois Tool Works | COM | 452308109 | 30,925 | 197,400 | SH | SOLE | 0 | 0 | 197,400 | ||
| Intel | COM | 458140100 | 28,575 | 548,667 | SH | SOLE | 0 | 0 | 548,667 | ||
| International Business Machine | COM | 459200101 | 534 | 3,481 | SH | SOLE | 0 | 0 | 3,481 | ||
| Intuitive Surgical Inc Com New | COM | 46120E602 | 403 | 975 | SH | SOLE | 0 | 0 | 975 | ||
| Johnson & Johnson Com | COM | 478160104 | 22,946 | 179,059 | SH | SOLE | 0 | 0 | 179,059 | ||
| Lowes Cos Inc | COM | 548661107 | 210 | 2,396 | SH | SOLE | 0 | 0 | 2,396 | ||
| Luminex Corp | COM | 55027E102 | 817 | 38,777 | SH | SOLE | 0 | 0 | 38,777 | ||
| Magellan Midstream Prt Unit Rp | COM | 559080106 | 467 | 8,000 | SH | SOLE | 0 | 0 | 8,000 | ||
| Mastercard Inc Cl A | COM | 57636q104 | 201 | 1,147 | SH | SOLE | 0 | 0 | 1,147 | ||
| McCormick | COM | 579780206 | 11,740 | 110,347 | SH | SOLE | 0 | 0 | 110,347 | ||
| McDermott Intl Inc | COM | 580037109 | 429 | 70,436 | SH | SOLE | 0 | 0 | 70,436 | ||
| Medtronic PLC | COM | g5960l103 | 502 | 6,257 | SH | SOLE | 0 | 0 | 6,257 | ||
| Merck & Co Inc New | COM | 58933Y105 | 208 | 3,813 | SH | SOLE | 0 | 0 | 3,813 | ||
| Microsoft | COM | 594918104 | 35,717 | 391,332 | SH | SOLE | 0 | 0 | 391,332 | ||
| National Instr | COM | 636518102 | 24,074 | 476,044 | SH | SOLE | 0 | 0 | 476,044 | ||
| Netflix Inc | COM | 64110L106 | 219 | 740 | SH | SOLE | 0 | 0 | 740 | ||
| Nokia | COM | 654902204 | 83 | 15,250 | SH | SOLE | 0 | 0 | 15,250 | ||
| Nordson | COM | 655663102 | 35,972 | 263,840 | SH | SOLE | 0 | 0 | 263,840 | ||
| Novartis AG | COM | 66987V109 | 15,775 | 195,112 | SH | SOLE | 0 | 0 | 195,112 | ||
| Paccar | COM | 693718108 | 16,767 | 253,397 | SH | SOLE | 0 | 0 | 253,397 | ||
| PepsiCo | COM | 713448108 | 19,102 | 175,010 | SH | SOLE | 0 | 0 | 175,010 | ||
| Pfizer, Inc. | COM | 717081103 | 568 | 15,994 | SH | SOLE | 0 | 0 | 15,994 | ||
| Phillips 66 COM | COM | 718546104 | 292 | 3,042 | SH | SOLE | 0 | 0 | 3,042 | ||
| Procter & Gamble | COM | 742718109 | 16,903 | 213,201 | SH | SOLE | 0 | 0 | 213,201 | ||
| Sabine Royalty Trust UBI | COM | 785688102 | 615 | 14,000 | SH | SOLE | 0 | 0 | 14,000 | ||
| San Juan Basin Royalty Trust | COM | 798241105 | 5,115 | 647,452 | SH | SOLE | 0 | 0 | 647,452 | ||
| Schlumberger Ltd | COM | 806857108 | 12,595 | 194,429 | SH | SOLE | 0 | 0 | 194,429 | ||
| Sysco Corp | COM | 871829107 | 257 | 4,293 | SH | SOLE | 0 | 0 | 4,293 | ||
| Telefonica de Espana | COM | 879382208 | 278 | 28,192 | SH | SOLE | 0 | 0 | 28,192 | ||
| United Parcel Svc Cl B | COM | 911312106 | 16,065 | 153,499 | SH | SOLE | 0 | 0 | 153,499 | ||
| Verizon Communications | COM | 92343v104 | 202 | 4,227 | SH | SOLE | 0 | 0 | 4,227 | ||
| Waste Management Inc Del | COM | 94106L109 | 294 | 3,500 | SH | SOLE | 0 | 0 | 3,500 | ||