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Inventories (Details) - USD ($)
Jun. 30, 2023
Dec. 31, 2022
Inventories    
Raw materials $ 38,535,000 $ 46,476,000
Work in process 45,464,000 39,956,000
Finished goods 3,064,000 3,197,000
Inventories, Total 87,063,000 89,629,000
Inventory reserve 26,800,000 24,700,000
Excess and obsolete inventory $ 75,000 $ 47,000