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Inventories consist of the following: (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 4,819 $ 2,825
Finished goods 1,682 1,545
 Inventories, gross 6,501 4,370
Allowance for excess quantities (406) (30)
 Inventories, net $ 6,095 $ 4,340