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Note 11 - Supplementary Balance Sheet Information | 12 Months Ended
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Sep. 30, 2025
Notes to Financial Statements |
Supplemental Balance Sheet Disclosures [Text Block] | 11. Supplementary Balance Sheet Information The following is a summary of accounts receivable at September 30, 2025 and 2024 (in thousands):
|  | September 30, |
|  | 2025 |  |  | 2024 |
Accounts receivable |  | $ | 146,830 |  |  | $ | 159,521 |
Less allowance for expected credit losses |  |  | (4,649 | ) |  |  | (5,349 | )
Accounts receivable, net |  | $ | 142,181 |  |  | $ | 154,172 |
The allowance for expected credit losses for the fiscal years ended September 30, 2025, 2024 and 2023 is as follows (in thousands):
|  | Year Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Balance at beginning of period |  | $ | 5,349 |  |  | $ | 7,745 |  |  | $ | 5,162 |
Provisions |  |  | 3,745 |  |  |  | 7,250 |  |  |  | 8,849 |
Payments received |  |  | (3,872 | ) |  |  | (8,352 | ) |  |  | (6,196 | )
Write-offs and adjustments |  |  | (573 | ) |  |  | (1,294 | ) |  |  | (70 | )
Balance at end of period |  | $ | 4,649 |  |  | $ | 5,349 |  |  | $ | 7,745 |
The following is a summary of inventories at September 30, 2025 and 2024 (in thousands):
|  | September 30, |
|  | 2025 |  |  | 2024 |
Raw materials and purchased parts |  | $ | 33,319 |  |  | $ | 27,461 |
Work-in-process |  |  | 5,050 |  |  |  | 7,739 |
Finished goods |  |  | 36,587 |  |  |  | 36,120 |
Total inventories |  | $ | 74,956 |  |  | $ | 71,320 |
The activity for excess and obsolete inventory reserves is as follows for the fiscal years ended September 30, 2025, 2024 and 2023 (in thousands):
|  | Year Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Balance at beginning of period |  | $ | 6,067 |  |  | $ | 4,732 |  |  | $ | 4,082 |
Provisions |  |  | 5,421 |  |  |  | 4,018 |  |  |  | 1,844 |
Inventory disposals and adjustments |  |  | (5,620 | ) |  |  | (2,683 | ) |  |  | (1,194 | )
Balance at end of period |  | $ | 5,868 |  |  | $ | 6,067 |  |  | $ | 4,732 |
The activity for valuation allowance for deferred tax assets is as follows for the fiscal years ended September 30, 2025, 2024 and 2023 (in thousands):
|  | Year Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Balance at beginning of period |  | $ | 44,222 |  |  | $ | 7,214 |  |  | $ | 5,927 |
Charge to income tax provision (benefit) |  |  | 36,475 |  |  |  | 31,793 |  |  |  | (7 | )
Charged to other accounts |  |  | 21,324 |  |  |  | 5,215 |  |  |  | 1,294 |
Balance at end of period |  | $ | 102,021 |  |  | $ | 44,222 |  |  | $ | 7,214 |
The following is a summary of product warranty and retrofit activity on a gross basis for the fiscal years ended September 30, 2025, 2024 and 2023 (in thousands):
|  | Year Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Balance at beginning of period |  | $ | 5,213 |  |  | $ | 3,974 |  |  | $ | 2,890 |
Accruals for warranties during the year |  |  | 927 |  |  |  | 2,741 |  |  |  | 2,564 |
Costs incurred during the year |  |  | (1,427 | ) |  |  | (1,502 | ) |  |  | (1,480 | )
Balance at end of period |  | $ | 4,713 |  |  | $ | 5,213 |  |  | $ | 3,974 |

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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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