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Note 8 - Property, Plant and Equipment | 6 Months Ended
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Jun. 30, 2023
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): ​
​ |  | June 30, 2023 |  |  | December 31, 2022 |
Land improvements |  | $ | 806 |  |  | $ | 806 |
Buildings and improvements |  |  | 85,342 |  |  |  | 86,372 |
Machinery and equipment |  |  | 247,242 |  |  |  | 251,216 |
Furniture and fixtures |  |  | 5,346 |  |  |  | 5,382 |
Computer equipment and software |  |  | 11,587 |  |  |  | 11,713 |
Transportation equipment |  |  | 661 |  |  |  | 679 |
​ |  |  | 350,984 |  |  |  | 356,168 |
Less accumulated depreciation and amortization |  |  | (183,479 | ) |  |  | (177,519 | )
​ |  |  | 167,505 |  |  |  | 178,649 |
Construction in progress |  |  | 29,273 |  |  |  | 30,434 |
Land |  |  | 1,101 |  |  |  | 1,101 |
Total property, plant and equipment, net |  | $ | 197,879 |  |  | $ | 210,184 |
​ For the three months ended June 30, 2023 and 2022, the depreciation expense of property, plant and equipment was $5.0 million and $5.7 million, respectively. For the six months ended June 30, 2023 and 2022, the depreciation expense of property, plant and equipment was $10.2 million and $11.7 million, respectively. For the three months ended June 30, 2023 and 2022, the capitalized interest was $0 million and $0.2 million, respectively. As of June 30, 2023, 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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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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