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Note 15 - Property, Plant, and Equipment (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Contractual commitments for acquisition of property, plant and equipment $ 2,125 $ 2,122
Rehabilitation costs capitalised 218 557
Additions other than through business combinations, property, plant and equipment 20,949 19,159
Borrowing costs capitalised 155  
Property, plant and equipment at end of period 82,078 64,873
Construction in progress [member]    
Statement Line Items [Line Items]    
Additions other than through business combinations, property, plant and equipment 19,556 17,731
Property, plant and equipment at end of period $ 48,943 $ 34,086