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Note 2 - Acquisition of EMI Industries, LLC (Details Textual) - USD ($)		2 Months Ended	3 Months Ended	12 Months Ended
	Apr. 18, 2024	Jun. 30, 2024	Sep. 30, 2024	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2021
Business Combination, Acquisition-Related Cost, Expense				$ 8,340,000	$ 900,000	$ 735,000
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 75,000,000
EMI Industries [Member]
Business Combination, Consideration Transferred	$ 50,000,000
Business Combination, Consideration Transferred, Liabilities Incurred	100,000
Payments to Acquire Businesses, Gross	49,900,000		$ 59,000
Business Combination, Acquisition-Related Cost, Expense	1,000,000
Business Combination, Acquired Receivable, Purchased without Credit Deterioration, Gross Contractual Amount	$ 11,900,000
Business Combination, Acquiree's Revenue since Acquisition Date, Actual		$ 18,100,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		$ 700,000
Business Combination, Pro Forma Information, Pro Forma Income (Loss) from Continuing Operations, after Tax						$ 36,303,000