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 | 26,893 | 114,257 | SH | SOLE | 0 | 0 | 114,257 | ||
| A T & T Inc New | COM | 00206r102 | 495 | 12,743 | SH | SOLE | 0 | 0 | 12,743 | ||
| Abbott Labs | COM | 002824100 | 815 | 14,282 | SH | SOLE | 0 | 0 | 14,282 | ||
| Abbvie Inc. Com | COM | 00287y109 | 1,793 | 18,537 | SH | SOLE | 0 | 0 | 18,537 | ||
| Alphabet Inc Cap Stk Cl A | COM | 02079k305 | 344 | 327 | SH | SOLE | 0 | 0 | 327 | ||
| Amazon.Com Inc | COM | 023135106 | 795 | 680 | SH | SOLE | 0 | 0 | 680 | ||
| Apple Computer | COM | 037833100 | 8,944 | 52,853 | SH | SOLE | 0 | 0 | 52,853 | ||
| Auto Data Processing | COM | 053015103 | 25,218 | 215,189 | SH | SOLE | 0 | 0 | 215,189 | ||
| Becton Dickinson | COM | 075887109 | 15,380 | 71,849 | SH | SOLE | 0 | 0 | 71,849 | ||
| Bellicum Pharmaceutica | COM | 079481107 | 201 | 23,900 | SH | SOLE | 0 | 0 | 23,900 | ||
| Berkshire Hathaway Cl B | COM | 084670702 | 470 | 2,372 | SH | SOLE | 0 | 0 | 2,372 | ||
| Black Box Corp Del Com | COM | 091826107 | 53 | 15,000 | SH | SOLE | 0 | 0 | 15,000 | ||
| Black Stone Minerals L Com Uni | COM | 09225m101 | 1,274 | 70,998 | SH | SOLE | 0 | 0 | 70,998 | ||
| Bristol Myers Squibb | COM | 110122108 | 334 | 5,450 | SH | SOLE | 0 | 0 | 5,450 | ||
| CVS Health | COM | 126650100 | 9,908 | 136,665 | SH | SOLE | 0 | 0 | 136,665 | ||
| Chevron Corp | COM | 166764100 | 2,741 | 21,891 | SH | SOLE | 0 | 0 | 21,891 | ||
| Clorox Co Del | COM | 189054109 | 254 | 1,710 | SH | SOLE | 0 | 0 | 1,710 | ||
| Coca-Cola | COM | 191216100 | 18,366 | 400,308 | SH | SOLE | 0 | 0 | 400,308 | ||
| Colgate Palmolive | COM | 194162103 | 322 | 4,268 | SH | SOLE | 0 | 0 | 4,268 | ||
| Dominion Energy Inc | COM | 25746U109 | 947 | 11,680 | SH | SOLE | 0 | 0 | 11,680 | ||
| Donaldson | COM | 257651109 | 26,073 | 532,644 | SH | SOLE | 0 | 0 | 532,644 | ||
| Dorchester Minerals LP | COM | 25820R105 | 1,110 | 73,023 | SH | SOLE | 0 | 0 | 73,023 | ||
| Dover | COM | 260003108 | 22,073 | 218,564 | SH | SOLE | 0 | 0 | 218,564 | ||
| Dow Dupont Inc Com | COM | 26078j100 | 441 | 6,187 | SH | SOLE | 0 | 0 | 6,187 | ||
| Ecolab | COM | 278865100 | 23,542 | 175,453 | SH | SOLE | 0 | 0 | 175,453 | ||
| Emerson Electric | COM | 291011104 | 19,159 | 274,912 | SH | SOLE | 0 | 0 | 274,912 | ||
| Exxon Mobil Corp | COM | 30231g102 | 4,214 | 50,385 | SH | SOLE | 0 | 0 | 50,385 | ||
| FedEx | COM | 31428x106 | 27,949 | 112,003 | SH | SOLE | 0 | 0 | 112,003 | ||
| Home Depot Inc | COM | 437076102 | 307 | 1,619 | SH | SOLE | 0 | 0 | 1,619 | ||
| Honeywell International | COM | 438516106 | 19,275 | 125,686 | SH | SOLE | 0 | 0 | 125,686 | ||
| Illinois Tool Works | COM | 452308109 | 33,129 | 198,557 | SH | SOLE | 0 | 0 | 198,557 | ||
| Intel | COM | 458140100 | 25,442 | 551,167 | SH | SOLE | 0 | 0 | 551,167 | ||
| International Business Machine | COM | 459200101 | 533 | 3,477 | SH | SOLE | 0 | 0 | 3,477 | ||
| Intuitive Surgical Inc Com New | COM | 46120E602 | 356 | 975 | SH | SOLE | 0 | 0 | 975 | ||
| Johnson & Johnson | COM | 478160104 | 25,085 | 179,534 | SH | SOLE | 0 | 0 | 179,534 | ||
| Lowes Cos Inc | COM | 548661107 | 223 | 2,395 | SH | SOLE | 0 | 0 | 2,395 | ||
| Luminex Corp | COM | 55027E102 | 764 | 38,777 | SH | SOLE | 0 | 0 | 38,777 | ||
| Magellan Midstream Prt Unit Rp | COM | 559080106 | 568 | 8,000 | SH | SOLE | 0 | 0 | 8,000 | ||
| McCormick | COM | 579780206 | 11,251 | 110,401 | SH | SOLE | 0 | 0 | 110,401 | ||
| McDermott Intl Inc | COM | 580037109 | 306 | 46,510 | SH | SOLE | 0 | 0 | 46,510 | ||
| Medtronic PLC | COM | g5960l103 | 505 | 6,257 | SH | SOLE | 0 | 0 | 6,257 | ||
| Merck & Co Inc New | COM | 58933Y105 | 215 | 3,813 | SH | SOLE | 0 | 0 | 3,813 | ||
| Microsoft | COM | 594918104 | 33,659 | 393,493 | SH | SOLE | 0 | 0 | 393,493 | ||
| National Instr | COM | 636518102 | 20,015 | 480,784 | SH | SOLE | 0 | 0 | 480,784 | ||
| Nokia | COM | 654902204 | 71 | 15,250 | SH | SOLE | 0 | 0 | 15,250 | ||
| Nordson | COM | 655663102 | 38,805 | 265,059 | SH | SOLE | 0 | 0 | 265,059 | ||
| Novartis AG | COM | 66987V109 | 16,419 | 195,556 | SH | SOLE | 0 | 0 | 195,556 | ||
| Paccar | COM | 693718108 | 18,088 | 254,475 | SH | SOLE | 0 | 0 | 254,475 | ||
| PepsiCo | COM | 713448108 | 21,056 | 175,587 | SH | SOLE | 0 | 0 | 175,587 | ||
| Pfizer, Inc. | COM | 717081103 | 579 | 15,994 | SH | SOLE | 0 | 0 | 15,994 | ||
| Phillips 66 COM | COM | 718546104 | 288 | 2,843 | SH | SOLE | 0 | 0 | 2,843 | ||
| Procter & Gamble | COM | 742718109 | 19,648 | 213,840 | SH | SOLE | 0 | 0 | 213,840 | ||
| Sabine Royalty Trust UBI | COM | 785688102 | 624 | 14,000 | SH | SOLE | 0 | 0 | 14,000 | ||
| San Juan Basin Royalty Trust | COM | 798241105 | 5,335 | 647,452 | SH | SOLE | 0 | 0 | 647,452 | ||
| Schlumberger Ltd | COM | 806857108 | 12,987 | 192,721 | SH | SOLE | 0 | 0 | 192,721 | ||
| Sysco Corp | COM | 871829107 | 261 | 4,290 | SH | SOLE | 0 | 0 | 4,290 | ||
| Telefonica de Espana | COM | 879382208 | 273 | 28,192 | SH | SOLE | 0 | 0 | 28,192 | ||
| United Parcel Svc Cl B | COM | 911312106 | 18,312 | 153,686 | SH | SOLE | 0 | 0 | 153,686 | ||
| Verizon Communications | COM | 92343v104 | 259 | 4,884 | SH | SOLE | 0 | 0 | 4,884 | ||
| Walt Disney | COM | 254687106 | 202 | 1,882 | SH | SOLE | 0 | 0 | 1,882 | ||
| Waste Management Inc Del | COM | 94106L109 | 302 | 3,500 | SH | SOLE | 0 | 0 | 3,500 | ||