| Segment Reporting [Table Text Block] |
| | | Three Months Ended | | | Nine Months Ended | |
| | | June 30, 2026 | | | June 30, 2025 | | | June 30, 2026 | | | June 30, 2025 | |
| Revenue: | | | | | | | | | | | | | | | | |
| Smart Water | | $ | 4,622 | | | $ | 10,518 | | | $ | 14,106 | | | $ | 27,278 | |
| Energy Solutions | | | 5,851 | | | | 8,107 | | | | 30,116 | | | | 34,977 | |
| Intelligent Industrial | | | 5,246 | | | | 6,136 | | | | 16,656 | | | | 17,596 | |
| Corporate | | | 85 | | | | 82 | | | | 254 | | | | 238 | |
| | | | 15,804 | | | | 24,843 | | | | 61,132 | | | | 80,089 | |
| | | | | | | | | | | | | | | | | |
| Cost of revenue: | | | | | | | | | | | | | | | | |
| Smart Water | | | 3,394 | | | | 5,946 | | | | 10,025 | | | | 16,670 | |
| Energy Solutions | | | 7,596 | | | | 6,213 | | | | 33,619 | | | | 19,337 | |
| Intelligent Industrial | | | 4,274 | | | | 5,107 | | | | 13,499 | | | | 14,545 | |
| Corporate | | | 44 | | | | 38 | | | | 103 | | | | 101 | |
| | | | 15,308 | | | | 17,304 | | | | 57,246 | | | | 50,653 | |
| | | | | | | | | | | | | | | | | |
| Gross profit (loss): | | | | | | | | | | | | | | | | |
| Smart Water | | | 1,228 | | | | 4,572 | | | | 4,081 | | | | 10,608 | |
| Energy Solutions | | | (1,745 | ) | | | 1,894 | | | | (3,503 | ) | | | 15,640 | |
| Intelligent Industrial | | | 972 | | | | 1,029 | | | | 3,157 | | | | 3,051 | |
| Corporate | | | 41 | | | | 44 | | | | 151 | | | | 137 | |
| | | | 496 | | | | 7,539 | | | | 3,886 | | | | 29,436 | |
| | | | | | | | | | | | | | | | | |
| Operating expenses: | | | | | | | | | | | | | | | | |
| Smart Water | | | 2,176 | | | | 2,339 | | | | 7,452 | | | | 6,585 | |
| Energy Solutions | | | 2,845 | | | | 3,128 | | | | 9,303 | | | | 10,260 | |
| Intelligent Industrial | | | 1,436 | | | | 2,070 | | | | 5,021 | | | | 6,319 | |
| Corporate | | | 4,177 | | | | 4,249 | | | | 13,914 | | | | 12,965 | |
| | | | 10,634 | | | | 11,786 | | | | 35,690 | | | | 36,129 | |
| | | | | | | | | | | | | | | | | |
| Gain on disposal of property | | | — | | | | 4,616 | | | | — | | | | 4,616 | |
| | | | | | | | | | | | | | | | | |
| Income (loss) from operations: | | | | | | | | | | | | | | | | |
| Smart Water | | | (948 | ) | | | 2,233 | | | | (3,371 | ) | | | 4,023 | |
| Energy Solutions | | | (4,590 | ) | | | (1,234 | ) | | | (12,806 | ) | | | 5,380 | |
| Intelligent Industrial | | | (464 | ) | | | (1,041 | ) | | | (1,864 | ) | | | (3,268 | ) |
| Corporate | | | (4,136 | ) | | | 411 | | | | (13,763 | ) | | | (8,212 | ) |
| | | | (10,138 | ) | | | 369 | | | | (31,804 | ) | | | (2,077 | ) |
| | | | | | | | | | | | | | | | | |
| Other segment disclosures: | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | |
| Interest income: | | | | | | | | | | | | | | | | |
| Smart Water | | | — | | | | — | | | | — | | | | — | |
| Energy Solutions | | | 464 | | | | 403 | | | | 1,598 | | | | 1,202 | |
| Intelligent Industrial | | | — | | | | — | | | | — | | | | — | |
| Corporate | | | 57 | | | | 134 | | | | 173 | | | | 773 | |
| | | | 521 | | | | 537 | | | | 1,771 | | | | 1,975 | |
| Interest expense: | | | | | | | | | | | | | | | | |
| Smart Water | | | — | | | | — | | | | — | | | | — | |
| Energy Solutions | | | 40 | | | | — | | | | 112 | | | | — | |
| Intelligent Industrial | | | — | | | | — | | | | — | | | | — | |
| Corporate | | | — | | | | 44 | | | | — | | | | 131 | |
| | | | 40 | | | | 44 | | | | 112 | | | | 131 | |
| | | | | | | | | | | | | | | | | |
| Depreciation and amortization expenses: | | | | | | | | | | | | | | | | |
| Smart Water | | | 502 | | | | 118 | | | | 999 | | | | 351 | |
| Energy Solutions | | | 1,218 | | | | 1,417 | | | | 4,798 | | | | 4,827 | |
| Intelligent Industrial | | | 547 | | | | 121 | | | | 1,010 | | | | 375 | |
| Corporate | | | 363 | | | | 743 | | | | 1,093 | | | | 2,105 | |
| | | | 2,630 | | | | 2,399 | | | | 7,900 | | | | 7,658 | |
| | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | |
| Inventory obsolescence and stock-based compensation expenses: | | | | | | | | | | | | | | | | |
| Smart Water | | | 96 | | | | 51 | | | | 457 | | | | 74 | |
| Energy Solutions | | | 293 | | | | 42 | | | | 1,351 | | | | 1,117 | |
| Intelligent Industrial | | | 267 | | | | 271 | | | | 892 | | | | 338 | |
| Corporate | | | 160 | | | | 135 | | | | 634 | | | | 771 | |
| | | | 816 | | | | 499 | | | | 3,334 | | | | 2,300 | |
| | | | | | | | | | | | | | | | | |
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| Segment Reporting, Reconciliation of Revenue by Segment to Consolidated [Table Text Block] |
| | | Three Months Ended | | | Nine Months Ended | |
| | | June 30, 2026 | | | June 30, 2025 | | | June 30, 2026 | | | June 30, 2025 | |
| Asia (including Russian Federation) | | $ | 3,189 | | | $ | 1,484 | | | $ | 5,793 | | | $ | 23,111 | |
| Canada | | | 485 | | | | 1,094 | | | | 2,536 | | | | 1,987 | |
| Europe | | | 873 | | | | 2,119 | | | | 2,638 | | | | 4,633 | |
| Mexico | | | 368 | | | | 240 | | | | 476 | | | | 2,332 | |
| United States | | | 8,906 | | | | 18,333 | | | | 42,303 | | | | 45,861 | |
| South America | | | 1,450 | | | | 1,390 | | | | 5,753 | | | | 1,742 | |
| Other | | | 533 | | | | 183 | | | | 1,633 | | | | 423 | |
| | | $ | 15,804 | | | $ | 24,843 | | | $ | 61,132 | | | $ | 80,089 | |
|