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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Revenue from Contract with Customer, Excluding Assessed Tax | $ 135,598 | $ 124,509
Product [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 116,036 | 73,333
Operating Segments [Member] | Oil and Gas Markets [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 77,455 | 73,993
Operating Segments [Member] | Oil and Gas Markets [Member] | Traditional Exploration Product Revenue [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 9,666 | 12,081
Operating Segments [Member] | Oil and Gas Markets [Member] | Wireless Exploration Product Revenue [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 48,094 | 10,168
Operating Segments [Member] | Oil and Gas Markets [Member] | Reservoir Product Revenue [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 596 | 962
Operating Segments [Member] | Oil and Gas Markets [Member] | Product [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 58,356 | 23,211
Operating Segments [Member] | Adjacent Markets [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 55,625 | 49,039
Operating Segments [Member] | Adjacent Markets [Member] | Product [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 55,458 | 48,888
Operating Segments [Member] | Adjacent Markets [Member] | Industrial Product [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 43,058 | 36,859
Operating Segments [Member] | Adjacent Markets [Member] | Imaging Products [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 12,400 | 12,029
Operating Segments [Member] | Emerging Markets [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,222 | 1,234
Operating Segments [Member] | Emerging Markets [Member] | Product [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 2,222 | $ 1,234

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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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