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Note 17 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Contractual commitments for acquisition of property, plant and equipment $ 3,981 $ 2,125
Rehabilitation costs capitalised 161 218
Additions other than through business combinations, property, plant and equipment 19,915 20,949
Borrowing costs capitalised 61 155
Property, plant and equipment at end of period 97,427 82,078
Construction in progress [member]    
Statement Line Items [Line Items]    
Additions other than through business combinations, property, plant and equipment 19,323 19,556
Property, plant and equipment at end of period $ 62,624 $ 48,943