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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, 2025 | Jun. 30, 2024 | Sep. 30, 2021
Payments to Acquire Businesses, Gross |  |  |  | $ 24,552,000 | $ 49,900,000 |
Business Combination, Acquisition-Related Cost, Expense |  |  |  | 1,047,000 |  |
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 |  |  |
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 |

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