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Note 9 - Segment information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Note 9 - Segment information (Details) [Line Items]        
Number of Reportable Segments     2  
Mexico [Member] | Sales Revenue, Goods, Net [Member]
       
Note 9 - Segment information (Details) [Line Items]        
Concentration Risk, Percentage 3.00% 3.00% 3.00% 4.00%