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Schedule of Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 54,443 $ 47,282
Work in process 11,126 19,345
Finished goods 8,789 4,941
Stores and spares 9,869 8,981
Packing material 870 783
 Total Inventories, gross 85,097 81,332
Less: Inventory allowance (122) (83)
 Total inventories, net $ 84,975 $ 81,249