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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Total revenue | $ 25,858 | $ 32,715 | $ 100,160 | $ 95,194
Product [Member] |  |  |  |
Total revenue | 20,223 | 19,727 | 83,434 | 56,976
Operating Segments [Member] | Oil and Gas Markets [Member] |  |  |  |
Total revenue | 9,174 | 17,672 | 59,930 | 56,239
Operating Segments [Member] | Oil and Gas Markets [Member] | Traditional Exploration Product Revenue [Member] |  |  |  |
Total revenue | 2,005 | 3,363 | 7,239 | 9,414
Operating Segments [Member] | Oil and Gas Markets [Member] | Wireless Exploration Product Revenue [Member] |  |  |  |
Total revenue | 1,460 | 907 | 36,008 | 8,077
Operating Segments [Member] | Oil and Gas Markets [Member] | Reservoir Product Revenue [Member] |  |  |  |
Total revenue | 189 | 523 | 303 | 810
Operating Segments [Member] | Oil and Gas Markets [Member] | Product [Member] |  |  |  |
Total revenue | 3,654 | 4,793 | 43,550 | 18,301
Operating Segments [Member] | Adjacent Markets [Member] |  |  |  |
Total revenue | 15,970 | 14,862 | 38,020 | 38,392
Operating Segments [Member] | Adjacent Markets [Member] | Product [Member] |  |  |  |
Total revenue | 15,929 | 14,825 | 37,897 | 38,282
Operating Segments [Member] | Adjacent Markets [Member] | Industrial Product [Member] |  |  |  |
Total revenue | 13,026 | 11,678 | 28,492 | 29,250
Operating Segments [Member] | Adjacent Markets [Member] | Imaging Products [Member] |  |  |  |
Total revenue | 2,903 | 3,147 | 9,405 | 9,032
Operating Segments [Member] | Emerging Markets [Member] |  |  |  |
Total revenue | 640 | 109 | 1,987 | 393
Operating Segments [Member] | Emerging Markets [Member] | Product [Member] |  |  |  |
Total revenue | $ 640 | $ 109 | $ 1,987 | $ 393

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479941/924-10-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-42 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-40 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-4 + Details
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