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Note 13 - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Federal $ 13,614 $ 38,161 $ 48,287
State 1,966 1,645 5,648
Foreign 3,588 5,701 2,214
Total 19,168 45,507 56,149
Federal 31,869 42,474 42,003
State 1,387 (3,134) 5,523
Foreign (7,326) (1,462) 167
Total 25,930 37,878 47,693
Change in valuation allowance 138 364 335
Provision for income taxes $ 45,236 $ 83,749 $ 104,177