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Note 8 - Supplementary Balance Sheet Information (Tables) | 9 Months Ended
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Jun. 30, 2025
Notes Tables |
Schedule of Inventory, Current [Table Text Block] |
​ |  | June 30, |  |  | September 30, |
​ |  | 2025 |  |  | 2024 |
​ |  |  |  |  |  |  |  |
Raw materials and purchased parts |  | $ | 35,796 |  |  | $ | 34,134 |
Work-in-process |  |  | 6,056 |  |  |  | 8,402 |
Finished goods |  |  | 38,654 |  |  |  | 36,387 |
Total inventories |  | $ | 80,506 |  |  | $ | 78,923 |
Schedule of Product Warranty Liability [Table Text Block] |
​ |  | Nine Months Ended June 30, |
​ |  | 2025 |  |  | 2024 |
​ |  | ​ |  |  | ​ |
Balance at beginning of period |  | $ | 5,213 |  |  | $ | 3,974 |
Accruals for warranties during the period |  |  | 587 |  |  |  | 1,939 |
Costs incurred during the period |  |  | (427 | ) |  |  | (1,184 | )
Balance at end of period |  | $ | 5,373 |  |  | $ | 4,729 |

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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-8 + Details
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