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Note 8 - Property, Plant & Equipment | 9 Months Ended
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Sep. 30, 2024
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): ​
​ |  | September 30, 2024 |  |  | December 31, 2023 |
Land improvements |  | $ | 806 |  |  | $ | 806 |
Buildings and improvements |  |  | 120,617 |  |  |  | 86,534 |
Machinery and equipment |  |  | 264,429 |  |  |  | 257,842 |
Furniture and fixtures |  |  | 5,115 |  |  |  | 5,449 |
Computer equipment and software |  |  | 12,955 |  |  |  | 12,059 |
Transportation equipment |  |  | 666 |  |  |  | 673 |
​ |  |  | 404,588 |  |  |  | 363,363 |
Less accumulated depreciation |  |  | (204,675 | ) |  |  | (194,086 | )
​ |  |  | 199,913 |  |  |  | 169,277 |
Construction in progress |  |  | 4,289 |  |  |  | 29,939 |
Land |  |  | 1,101 |  |  |  | 1,101 |
Total property, plant and equipment, net |  | $ | 205,303 |  |  | $ | 200,317 |
​ For the three months ended September 30, 2024 and 2023, the depreciation expense of property, plant and equipment was $5.1 million and $4.8 million, respectively. For the nine months ended September 30, 2024 and 2023, the depreciation expenses of property, plant and equipment were $15.0 million. As of September 30, 2024, 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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