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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands					9 Months Ended	12 Months Ended
	Feb. 05, 2025	Nov. 18, 2024	Nov. 13, 2024	Oct. 28, 2024	Mar. 31, 2026	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Goodwill						$ 581,553	$ 610,338	$ 281,283
Business Combination, Acquisition-Related Cost, Expense						4,059	21,434	2,622
Accounts Payable, Current						80,098	88,001
Amran and Narayan Group [Member]
Accounts Payable, Current						300	400
Amran and Narayan Group [Member] \| Payments for Inventory Purchases [Member]
Related Party Transaction, Amounts of Transaction						2,000	2,500
Amran and Narayan Group [Member] \| Rental Payments [Member]
Related Party Transaction, Amounts of Transaction						300	300
Amran and Narayan Group [Member] \| Sales Made to Related Parties [Member]
Related Party Transaction, Amounts of Transaction						$ 100	100	$ 100
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%
Business Combination, Acquisition-Related Cost, Expense							14,200
Business Combination, Acquiree's Revenue since Acquisition Date, Actual							84,400
Business Combination, Acquiree's Earnings (Loss) since Acquisition Date, Actual							$ 13,700
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
Nascent Technology Manufacturing [Member]
Business Combination, Consideration Transferred		$ 7,600
Goodwill		$ 6,500
Custom Biogenic Systems [Member]
Business Combination, Consideration Transferred			$ 4,700