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Segment information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
segment
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Segment information      
Number of operating segments | segment 1    
Number of reportable segments | segment 1    
Revenues $ 237,118 $ 289,025 $ 325,225
Less:      
Interest (income) expense - net 476 (8,352) (14,327)
Income taxes 7,639 17,573 13,381
Other income 2,726 (8,352) (14,327)
Net income $ 24,388 $ 52,247 $ 103,801
Other operating expenses, description 1Other operating expenses include miscellaneous, individually insignificant operating expenses. The Company’s CODM reviews these items in aggregate. 1Other operating expenses include miscellaneous, individually insignificant operating expenses. The Company’s CODM reviews these items in aggregate. 1Other operating expenses include miscellaneous, individually insignificant operating expenses. The Company’s CODM reviews these items in aggregate.
Single Reporting Segment      
Segment information      
Revenues $ 237,118 $ 289,025 $ 325,225
Less:      
Cost of materials and plant overhead 157,508 163,701 151,953
Payroll expense and benefits 31,625 28,186 27,467
Interest (income) expense - net (476) 8,352 14,327
Depreciation and amortization 6,387 5,782 5,977
Professional fees 6,720 4,423 3,848
Other operating expenses 5,577 8,761 4,471
Income taxes 7,639 17,573 13,381
Other income (2,250)    
Net income $ 24,388 $ 52,247 $ 103,801