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Note 3 - Summary of Significant Accounting Policies (Details Textual)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Amortisation period of intangible assets material to entity 5 years 5 years
Bottom of range [member]    
Statement Line Items [Line Items]    
Amortisation period of intangible assets material to entity 3 years  
Top of range [member]    
Statement Line Items [Line Items]    
Amortisation period of intangible assets material to entity 5 years