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Note 8 - Income Taxes (Detail) - A reconciliation of the difference between the expected provision for income taxes using the U.S. federal tax rate and the actual provision (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Provision using statutory U.S. federal tax rate $ 21,152 $ 20,188 $ 18,066
Income earned in jurisdictions not subject to income taxes (12,362) (11,712) (8,916)
Impact of foreign tax rates (1,449) (1,732) (1,857)
$ 7,341 $ 6,744 $ 7,293