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Note 5 - Other Operating Income and Expenses (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Growth rate used to extrapolate cash flow projections 2.00%    
Impairment loss recognised in profit or loss $ 400,314
Welded pipe assets [member]      
Statement Line Items [Line Items]      
Impairment loss recognised in profit or loss $ 0 $ 0 $ 400,300
Bottom of range [member]      
Statement Line Items [Line Items]      
Discount rate applied to cash flow projections 9.40%    
Top of range [member]      
Statement Line Items [Line Items]      
Discount rate applied to cash flow projections 11.20%