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Note 13 - Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income taxes at the federal statutory rate $ 37,733 $ 45,691 $ 28,371
State income taxes, net of federal benefit 3,053 3,398 2,259
Tax effect of permanent differences 959 1,069 802
Other, net 5 428 412
Provision (benefit) for income taxes $ 41,750 $ 50,586 $ 31,844