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Note 4 - Significant Accounting Policies (Details Textual)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Buildings [member] | Bottom of range [member]    
Statement Line Items [Line Items]    
Property, plant, and equipment, useful life 10 years 10 years
Buildings [member] | Top of range [member]    
Statement Line Items [Line Items]    
Property, plant, and equipment, useful life 15 years 15 years
Machinery [member]    
Statement Line Items [Line Items]    
Property, plant, and equipment, useful life 10 years 10 years
Fixtures and fittings [member] | Bottom of range [member]    
Statement Line Items [Line Items]    
Property, plant, and equipment, useful life 4 years 4 years
Fixtures and fittings [member] | Top of range [member]    
Statement Line Items [Line Items]    
Property, plant, and equipment, useful life 10 years 10 years
Motor vehicles [member]    
Statement Line Items [Line Items]    
Property, plant, and equipment, useful life 4 years 4 years