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Note 8 - Property, Plant and Equipment | 3 Months Ended
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Mar. 31, 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): ​
​ |  | March 31, 2024 |  |  | December 31, 2023 |
Land improvements |  | $ | 806 |  |  | $ | 806 |
Buildings and improvements |  |  | 85,798 |  |  |  | 86,534 |
Machinery and equipment |  |  | 257,724 |  |  |  | 257,842 |
Furniture and fixtures |  |  | 5,189 |  |  |  | 5,449 |
Computer equipment and software |  |  | 12,473 |  |  |  | 12,059 |
Transportation equipment |  |  | 659 |  |  |  | 673 |
​ |  |  | 362,649 |  |  |  | 363,363 |
Less accumulated depreciation |  |  | (195,515 | ) |  |  | (194,086 | )
​ |  |  | 167,134 |  |  |  | 169,277 |
Construction in progress |  |  | 31,706 |  |  |  | 29,939 |
Land |  |  | 1,101 |  |  |  | 1,101 |
Total property, plant and equipment, net |  | $ | 199,941 |  |  | $ | 200,317 |
​ For the three months ended March 31, 2024 and 2023, the depreciation expense of property, plant and equipment was $4.9 million and $5.2 million, respectively. As of March 31, 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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