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Note 6 - Inventories (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Distributor Channel Inventories         $ 1,555
Inventory Write-down $ 170 $ 55 $ 425 $ 21