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Note 25 - Concentration of risk (Detail)
 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
Customer 1 [Member]
Jun. 30, 2012
Customer 2 [Member]
Dec. 31, 2011
Accounts Receivables [Member]
Jun. 30, 2012
Accounts Receivables [Member]
Jun. 30, 2012
Supplier 1 [Member]
Jun. 30, 2011
Supplier 1 [Member]
Jun. 30, 2012
Supplier 1 [Member]
Jun. 30, 2011
Supplier 1 [Member]
Jun. 30, 2012
Supplier 2 [Member]
Jun. 30, 2011
Supplier 2 [Member]
Jun. 30, 2012
Supplier 2 [Member]
Jun. 30, 2011
Supplier 2 [Member]
Jun. 30, 2011
Supplier 3 [Member]
Jun. 30, 2011
Supplier 3 [Member]
Number of Major Customers 1 1 2         1 1                    
Entity-Wide Revenue, Major Customer, Percentage 13.00% 11.00%       15.00% 14.00%                        
Percent of Accounts Receivables 17.00%   17.00%   21.00%                            
Number of Major Suppliers 2 3 2 3                              
Concentration Risk, Percentage                   57.00% 28.00% 62.00% 25.00% 13.00% 23.00% 13.00% 21.00% 18.00% 14.00%