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Note 8 - Inventories (Details Textual) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Inventory Write-down $ 3,993 $ 287
Nonsaleable Inventory [Member]    
Inventory Write-down 800  
HA Raw Materials [Member]    
Inventory Write-down 1,700  
HYAFF-based Products [Member]    
Inventory Write-down $ 1,200