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Note 8 - Property, Plant & Equipment | 3 Months Ended
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Mar. 31, 2022
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, 2022 |  |  | December 31, 2021 |
Land improvements |  | $ | 806 |  |  | $ | 806 |
Building and improvements |  |  | 89,248 |  |  |  | 89,698 |
Machinery and equipment |  |  | 264,554 |  |  |  | 266,386 |
Furniture and fixtures |  |  | 5,639 |  |  |  | 5,658 |
Computer equipment and software |  |  | 12,517 |  |  |  | 12,727 |
Transportation equipment |  |  | 737 |  |  |  | 726 |
​ |  |  | 373,501 |  |  |  | 376,001 |
Less accumulated depreciation and amortization |  |  | (171,505 | ) |  |  | (167,772 | )
​ |  |  | 201,996 |  |  |  | 208,229 |
Construction in progress |  |  | 33,677 |  |  |  | 33,705 |
Land |  |  | 1,101 |  |  |  | 1,101 |
Total property, plant and equipment, net |  | $ | 236,774 |  |  | $ | 243,035 |
​ For the three months ended March 31, 2022 and 2021, the depreciation expense of property, plant and equipment was $6.0 million and $6.3 million, respectively. For the three months ended March 31, 2022 and 2021, the capitalized interest was each $0.1 million. As of March 31, 2022, 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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