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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 05, 2025 | Oct. 28, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025
Goodwill |  |  | $ 599,923 |  | $ 610,338
Business Combination, Acquisition-Related Cost, Expense |  |  | 433 | $ 1,840 |
McStarlite [Member] |  |  |  |  |
Business Combination, Voting Equity Interest Acquired, Percentage | 100.00% |  |  |  |
Business Combination, Consideration Transferred | $ 57,000 |  | 56,963 |  | 56,963
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill | 24,500 |  | 24,500 |  | 24,500
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived | 19,700 |  |  |  |
Goodwill | 16,200 |  | 16,207 |  | 16,761
Payments to Acquire Businesses, Gross |  |  | $ 57,549 |  | $ 57,549
McStarlite [Member] | Trade Names [Member] |  |  |  |  |
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Indefinite-Lived | $ 4,800 |  |  |  |
McStarlite [Member] | Customer Relationships [Member] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 12 years |  |  |  |
Amran Instrument Transformers [Member] |  |  |  |  |
Business Combination, Voting Equity Interest Acquired, Percentage |  | 100.00% |  |  |
Business Combination, Consideration Transferred |  | $ 179,700 |  |  |
Payments to Acquire Businesses, Gross |  | $ 153,700 |  |  |
Amran Instrument Transformers [Member] | Common Stock [Member] |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) |  | 152,299 |  |  |
Amran Instrument Transformers [Member] | Treasury Stock, Common [Member] |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) |  | 26 |  |  |
Narayan Powertech Pvt. Ltd. [Member] |  |  |  |  |
Business Combination, Voting Equity Interest Acquired, Percentage |  | 90.10% |  |  |
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill |  | $ 136,000 |  |  |
Goodwill |  | 298,400 |  |  |
Payments to Acquire Businesses, Gross |  | $ 261,900 |  |  |
Business Combination, Period for Right to Transfer Remaining Interest (Year) |  | 3 years |  |  |
Business Combination, Period for Right to Acquire Remaining Interest (Year) |  | 3 years |  |  |
Pro Forma Information, Interest Rate Assumption |  |  | 7.70% |  |
Pro Forma Information, Tax Rate Assumed |  |  | 22.60% |  |
Narayan Powertech Pvt. Ltd. [Member] | Mold-Tech Singapore [Member] | Scenario, Plan [Member] |  |  |  |  |
Business Combination, Voting Equity Interest Acquired, Percentage |  | 9.90% |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  | $ 26,700 |  |  |
Narayan Powertech Pvt. Ltd. [Member] | Trade Names [Member] |  |  |  |  |
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Indefinite-Lived |  | 28,700 |  |  |
Narayan Powertech Pvt. Ltd. [Member] | Customer Relationships [Member] |  |  |  |  |
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived |  | $ 107,300 |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  | 12 years |  |  |

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