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BUSINESS SEGMENT - Summarized financial information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Business Segment |  |  |
Cost of goods sold | $ 197,644 | $ 191,057 | $ 293,350
Selling, general and administrative expenses | 32,747 | 27,376 | 43,213
Single reportable segment |  |  |
Business Segment |  |  |
Materials | 128,705 | 123,441 | 203,847
Overhead | 23,124 | 22,987 | 25,575
Labor costs | 26,660 | 25,887 | 33,907
Other cost of goods sold | 19,155 | 18,742 | 30,021
Cost of goods sold | 197,644 | 191,057 | 293,350
Employment costs | 18,016 | 17,580 | 28,439
Warranty expense | 4,536 | 3,616 | 5,829
Other selling, general and administrative expenses | 10,195 | 6,180 | 8,945
Selling, general and administrative expenses | $ 32,747 | $ 27,376 | $ 43,213

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