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Note 3 - Summary of Significant Accounting Policies - Useful Lives of Major Property, Plant and Equipment (Details)
 12 Months Ended
Dec. 31, 2017
Buildings [member]  
Statement Line Items [Line Items]  
Property, plant and equipment, useful life (Year) 25 years
Plant and equipment [member]  
Statement Line Items [Line Items]  
Property, plant and equipment, useful life (Year) 15 years
Fixtures [member]  
Statement Line Items [Line Items]  
Property, plant and equipment, useful life (Year) 10 years
Fittings [member]  
Statement Line Items [Line Items]  
Property, plant and equipment, useful life (Year) 10 years
External use assets [member] | Bottom of range [member]  
Statement Line Items [Line Items]  
Property, plant and equipment, useful life (Year) 2 years
External use assets [member] | Top of range [member]  
Statement Line Items [Line Items]  
Property, plant and equipment, useful life (Year) 5 years