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Note 16 - Supplemental information: (Detail)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
One Customer [Member] | Customer Concentration Risk [Member]
     
Number Of Customers 1    
Three Customers [Member] | Customer Concentration Risk [Member]
     
Number Of Customers   3  
Customer Concentration Risk [Member] | Accounts Receivable [Member]
     
Number Of Customers 1    
Customer Concentration Risk [Member]
     
Number Of Customers 0 0 0
One Customer [Member] | Accounts Receivable [Member]
     
Concentration Risk, Percentage 16.00%    
Sales Revenue, Goods, Net [Member]
     
Concentration Risk, Percentage 10.00%    
Accounts Receivable [Member]
     
Number Of Customers 0   3
Concentration Risk, Percentage 10.00% 16.00% 35.00%