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Note 21 - Segment and Geographic Information - Summary of Segment Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Revenue | $ 110,803 | $ 135,598
Cost of revenue | 77,906 | 83,025
Gross profit | 32,897 | 52,573
Operating expenses | 48,797 | 45,456
Gain (loss) on disposal of property | 4,679 | (16)
Income (loss) from operations | (11,284) | 7,117
Interest income | 2,537 | 1,558
Interest expense | 169 | 187
Depreciation and amortization | 10,146 | 14,766
Impairment, inventory obsolescence and stock-based compensation expenses | 4,576 | 4,654
Operating Segments [Member] | Smart Water [Member] |  |
Revenue | 35,816 | 32,434
Cost of revenue | 21,106 | 16,653
Gross profit | 14,710 | 15,781
Operating expenses | 9,047 | 6,566
Income (loss) from operations | 5,663 | 9,215
Interest income | 0 | 315
Interest expense | 0 | 17
Depreciation and amortization | 1,145 | 482
Impairment, inventory obsolescence and stock-based compensation expenses | 31 | 189
Operating Segments [Member] | Energy Solutions [Member] |  |
Revenue | 50,706 | 77,977
Cost of revenue | 36,580 | 46,922
Gross profit | 14,126 | 31,055
Operating expenses | 13,738 | 12,485
Income (loss) from operations | 388 | 18,570
Interest income | 1,694 | 0
Interest expense | 23 | 0
Depreciation and amortization | 7,333 | 13,243
Impairment, inventory obsolescence and stock-based compensation expenses | 2,618 | 993
Operating Segments [Member] | Intelligent Industrial [Member] |  |
Revenue | 23,960 | 24,891
Cost of revenue | 20,082 | 19,335
Gross profit | 3,878 | 5,556
Operating expenses | 8,207 | 12,247
Income (loss) from operations | (4,329) | (6,691)
Interest income | 0 | 0
Depreciation and amortization | 1,049 | 653
Impairment, inventory obsolescence and stock-based compensation expenses | 907 | 2,830
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |
Revenue | 321 | 296
Cost of revenue | 138 | 115
Gross profit | 183 | 181
Operating expenses | 17,805 | 14,158
Gain (loss) on disposal of property | 4,616 | 0
Income (loss) from operations | (13,006) | (13,977)
Interest income | 843 | 1,243
Interest expense | 146 | 170
Depreciation and amortization | 619 | 388
Impairment, inventory obsolescence and stock-based compensation expenses | $ 1,020 | $ 642

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