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Note 3 - Acquisition of EMI Industries, LLC (Details Textual) - USD ($)		2 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended
	Apr. 18, 2024	Jun. 30, 2024	Sep. 30, 2024	Mar. 31, 2025	Mar. 31, 2024	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2021
Line of Credit Facility, Maximum Borrowing Capacity								$ 100,000,000
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 75,000,000				$ 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	$ 59,000	$ (0)
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, Acquiree's Earnings (Loss) since Acquisition Date, Actual		$ 700,000
Business Combination, Pro Forma Information, Pro Forma Income (Loss) from Continuing Operations, after Tax						$ 36,303,000	$ 38,798,000