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Note 7 - Provision for income taxes (Details) - Summary of Provision for Income Taxes (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Summary of Provision for Income Taxes [Abstract]        
Provision for income taxes (in Dollars) $ 10,498 $ 4,217 $ 16,604 $ 9,083
Effective tax rate 36.60% 33.20% 34.00% 36.80%