BUSINESS SEGMENT - Summarized financial information (Details) - USD ($) $ in Thousands	12 Months Ended
	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