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PROPERTY, PLANT & EQUIPMENT & FINANCE LEASES (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - gross $ 168,776 $ 163,881
Less accumulated depreciation 120,705 118,869
Net property, plant and equipment 48,071 45,012
Finance leases 33,852 34,920
Less finance lease accumulated amortization 10,752 10,339
Net property, plant and equipment, and finance leases 71,171 69,593
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - gross 1,493 1,493
Buildings    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - gross 24,459 24,244
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - gross 125,805 123,678
Property under construction    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - gross $ 17,019 $ 14,466