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Note 20 - Segment and Geographic Information - Summary of Segment Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Revenue | $ 135,598 | $ 124,509
Income (loss) from operations | 7,117 | 11,328
Depreciation and amortization | 14,766 | 16,238
Impairment, inventory obsolescence and stock-based compensation expenses | 4,654 | 3,603
Interest income | 1,558 | 539
Interest expense | 187 | 134
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |
Revenue | 296 | 243
Income (loss) from operations | (13,976) | (11,918)
Depreciation and amortization | 388 | 542
Impairment, inventory obsolescence and stock-based compensation expenses | 642 | 566
Interest income | 1,243 | 187
Interest expense | 170 | 29
Oil and Gas Markets [Member] | Operating Segments [Member] |  |
Revenue | 77,455 | 73,993
Income (loss) from operations | 13,134 | 15,759
Depreciation and amortization | 13,243 | 14,428
Impairment, inventory obsolescence and stock-based compensation expenses | 993 | 2,329
Interest income | 315 | 352
Interest expense | 17 | 105
Adjacent Markets [Member] | Operating Segments [Member] |  |
Revenue | 55,625 | 49,039
Income (loss) from operations | 14,152 | 11,490
Depreciation and amortization | 860 | 703
Impairment, inventory obsolescence and stock-based compensation expenses | 221 | 656
Interest income | 0 | 0
Interest expense | 0 | 0
Emerging Markets [Member] | Operating Segments [Member] |  |
Revenue | 2,222 | 1,234
Income (loss) from operations | (6,193) | (4,003)
Depreciation and amortization | 275 | 565
Impairment, inventory obsolescence and stock-based compensation expenses | 2,798 | 52
Interest income | 0 | 0
Interest expense | $ 0 | $ 0

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