v3.26.1
Note 12 - Segment Information - Summary of Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Revenue $ 15,804 $ 24,843 $ 61,132 $ 80,089
Cost of revenue 15,308 17,304 57,246 50,653
Gross profit 496 7,539 3,886 29,436
Operating expenses 10,634 11,786 35,690 36,129
Gain on disposal of property 0 4,616 0 4,616
Income (loss) from operations (10,138) 369 (31,804) (2,077)
Interest income 521 537 1,771 1,975
Interest expense 40 44 112 131
Depreciation and amortization 2,630 2,399 7,900 7,658
Impairment, inventory obsolescence and stock-based compensation expenses 816 499 3,334 2,300
Operating Segments [Member] | Smart Water [Member]        
Revenue 4,622 10,518 14,106 27,278
Cost of revenue 3,394 5,946 10,025 16,670
Gross profit 1,228 4,572 4,081 10,608
Operating expenses 2,176 2,339 7,452 6,585
Income (loss) from operations (948) 2,233 (3,371) 4,023
Interest income 0 0 0 0
Interest expense 0 0 0 0
Depreciation and amortization 502 118 999 351
Impairment, inventory obsolescence and stock-based compensation expenses 96 51 457 74
Operating Segments [Member] | Energy Solutions [Member]        
Revenue 5,851 8,107 30,116 34,977
Cost of revenue 7,596 6,213 33,619 19,337
Gross profit (1,745) 1,894 (3,503) 15,640
Operating expenses 2,845 3,128 9,303 10,260
Income (loss) from operations (4,590) (1,234) (12,806) 5,380
Interest income 464 403 1,598 1,202
Interest expense 40 0 112 0
Depreciation and amortization 1,218 1,417 4,798 4,827
Impairment, inventory obsolescence and stock-based compensation expenses 293 42 1,351 1,117
Operating Segments [Member] | Intelligent Industrial [Member]        
Revenue 5,246 6,136 16,656 17,596
Cost of revenue 4,274 5,107 13,499 14,545
Gross profit 972 1,029 3,157 3,051
Operating expenses 1,436 2,070 5,021 6,319
Income (loss) from operations (464) (1,041) (1,864) (3,268)
Interest income 0 0 0 0
Interest expense 0 0 0 0
Depreciation and amortization 547 121 1,010 375
Impairment, inventory obsolescence and stock-based compensation expenses 267 271 892 338
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]        
Revenue 85 82 254 238
Cost of revenue 44 38 103 101
Gross profit 41 44 151 137
Operating expenses 4,177 4,249 13,914 12,965
Income (loss) from operations (4,136) 411 (13,763) (8,212)
Interest income 57 134 173 773
Interest expense 0 44 0 131
Depreciation and amortization 363 743 1,093 2,105
Impairment, inventory obsolescence and stock-based compensation expenses $ 160 $ 135 $ 634 $ 771