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Inventories consist of the following: (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Inventory Disclosure [Abstract]    
Raw materials $ 6,385 $ 4,819
Finished goods 2,374 1,682
Inventories, gross 8,759 6,501
Allowance for excess inventory quantities (200) (406)
Inventories, net $ 8,559 $ 6,095