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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