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Note 13 - Income Tax Expense (Benefits) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current provision-      
Federal $ 7,513 $ 21,826 $ 7,755
State 2,592 3,531 2,008
Total current 10,105 25,357 9,763
Deferred provision-      
Federal 29,561 23,243 20,470
State 2,084 1,986 1,611
Total deferred 31,645 25,229 22,081
Provision (benefit) for income taxes $ 41,750 $ 50,586 $ 31,844