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Note 19 - Segment and Geographic Information - Summary of Segment Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Revenue | $ 124,509 | $ 89,253
Income (loss) from operations | 11,328 | (23,136)
Depreciation and amortization | 16,238 | 19,560
Impairment, inventory obsolescence and stock-based compensation expenses | 3,603 | 9,694
Interest income | 539 | 976
Interest expense | 134 | 65
Corporate, Non-Segment [Member] |  |
Revenue | 243 | 230
Income (loss) from operations | (11,918) | (12,490)
Depreciation and amortization | 542 | 802
Impairment, inventory obsolescence and stock-based compensation expenses | 566 | 727
Interest income | 187 | 126
Interest expense | 29 | 0
Oil and Gas Markets [Member] | Operating Segments [Member] |  |
Revenue | 73,993 | 49,141
Income (loss) from operations | 15,759 | (7,539)
Depreciation and amortization | 14,428 | 16,947
Impairment, inventory obsolescence and stock-based compensation expenses | 2,329 | 3,612
Interest income | 352 | 850
Interest expense | 105 | 65
Adjacent Markets [Member] | Operating Segments [Member] |  |
Revenue | 49,039 | 39,171
Income (loss) from operations | 11,490 | 6,021
Depreciation and amortization | 703 | 743
Impairment, inventory obsolescence and stock-based compensation expenses | 656 | 932
Interest income | 0 | 0
Interest expense | 0 | 0
Emerging Markets [Member] | Operating Segments [Member] |  |
Revenue | 1,234 | 711
Income (loss) from operations | (4,003) | (9,128)
Depreciation and amortization | 565 | 1,068
Impairment, inventory obsolescence and stock-based compensation expenses | 52 | 4,423
Interest income | 0 | 0
Interest expense | $ 0 | $ 0

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