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Note 6 - Inventories - Write-off (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Change of inventory to net realizable value $ 168 $ 45 $ 537 $ 471