Note 2 - Acquisition of EMI Industries, LLC (Details Textual) - USD ($) $ in Thousands		2 Months Ended	12 Months Ended
	Apr. 18, 2024	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Line of Credit Facility, Maximum Borrowing Capacity						$ 100,000	$ 75,000
Payments to Acquire Businesses, Gross			$ 49,900	$ (0)
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax			36,303	$ 38,798
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 75,000	75,000		$ 75,000
EMI Industries [Member]
Business Combination, Consideration Transferred	$ 50,000
Business Combination, Consideration Transferred, Liabilities Incurred	100
Business Acquisition, Transaction Costs	1,000
Payments to Acquire Businesses, Gross	49,900
Business Combination, Acquired Receivables, Gross Contractual Amount	$ 11,900
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		18,100
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		$ 700
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax			$ 36,300