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Note 6 - Subsequent Event (Details Textual) - USD ($) $ in Millions | Aug. 05, 2025 | Jul. 29, 2025 | Jun. 30, 2025 | Jun. 29, 2025 | Jul. 07, 2021
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Revolving Credit Facility [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 80 |  | $ 80
Revolving Credit Facility [Member] | MT [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 80
Subsequent Event [Member] | Essco Holding Inc. [Member] |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 84 |  |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | Three Lenders [Member] |  |  |  |  |
Number of Lenders |  | three |  | three |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 150 |  | $ 150 |

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