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Note 8 - Property, Plant and Equipment | 3 Months Ended
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Mar. 31, 2025
Notes to Financial Statements |
Property, Plant and Equipment Disclosure [Text Block] | Note 8. Property, Plant & Equipment ​ Property, plant and equipment consisted of the following for the periods indicated (in thousands): ​
​ |  | March 31, 2025 |  |  | December 31, 2024 |
Land improvements |  | $ | 806 |  |  | $ | 806 |
Buildings and improvements |  |  | 120,088 |  |  |  | 118,648 |
Machinery and equipment |  |  | 296,966 |  |  |  | 275,617 |
Furniture and fixtures |  |  | 5,293 |  |  |  | 5,150 |
Computer equipment and software |  |  | 13,802 |  |  |  | 13,369 |
Transportation equipment |  |  | 643 |  |  |  | 647 |
​ |  |  | 437,598 |  |  |  | 414,237 |
Less accumulated depreciation |  |  | (209,085 | ) |  |  | (204,500 | )
​ |  |  | 228,513 |  |  |  | 209,737 |
Construction in progress |  |  | 11,839 |  |  |  | 8,397 |
Land |  |  | 1,101 |  |  |  | 1,101 |
Total property, plant and equipment, net |  | $ | 241,453 |  |  | $ | 219,235 |
​ For the three months ended March 31, 2025 and 2024, the depreciation expense of property, plant and equipment was $5.6 million and $4.9 million, respectively. As of March 31, 2025, the Company concluded that its continued loss history constitutes a triggering event as described in ASC 360-10-35-21, Property, Plant, and Equipment. The Company performed a recoverability test and concluded that future undiscounted cash flows exceed the carrying amount of the Company’s long-lived assets and therefore no impairment charge was recorded.

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