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Note 8 - Supplementary Balance Sheet Information | 9 Months Ended
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Jun. 30, 2025
Notes to Financial Statements |
Supplemental Balance Sheet Disclosures [Text Block] | 8. Supplementary Balance Sheet Information Inventories The following is a summary of inventories at June 30, 2025 and September 30, 2024 (in thousands):
​ |  | 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 |
Inventory reserves were $8.5 million and $6.1 million, respectively, at June 30, 2025 and September 30, 2024. Warranty and Retrofit Costs The following is a summary of product and warranty retrofit activity for the nine months ended June 30, 2025 and 2024 (in thousands):
​ |  | 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 The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/210/tableOfContent + Details
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