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Note 6 - Inventories (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Distributor Channel Inventories         $ 1,555
Inventory Write-down $ 45 $ 0 $ 471 $ 0