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Inventories (Details) - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Inventories    
Raw materials $ 41,543,000 $ 46,476,000
Work in process 46,943,000 39,956,000
Finished goods 3,192,000 3,197,000
Inventories, Total 91,678,000 89,629,000
Inventory reserve 25,900,000 24,700,000
Excess and obsolete inventory $ 50,000 $ 47,000