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Inventories consist of the following: (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 4,103 $ 2,825
Finished goods 1,548 1,545
  5,651 4,370
Allowance for excess inventory quantities (30) (30)
  $ 5,621 $ 4,340