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Note 13 - Income Taxes (Details) - Effective Income Tax Rate Reconciliation - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Effective Income Tax Rate Reconciliation [Abstract]        
Taxes at federal statutory rate $ 6,184 $ 6,392 $ 19,706 $ 19,169
Taxes at federal statutory rate 35.00% 35.00% 35.00% 35.00%
Increase (reduction) in taxes resulting from:        
State and local income tax, net of Federal income tax benefit $ 836 $ 1,183 $ 3,215 $ 3,948
State and local income tax, net of Federal income tax benefit 4.70% 6.50% 5.70% 7.20%
Other $ (359) $ (515) $ (1,193) $ (1,532)
Other (2.00%) (2.80%) (2.10%) (2.80%)
Taxes at effective rate $ 6,661 $ 7,060 $ 21,728 $ 21,585
Taxes at effective rate 37.70% 38.70% 38.60% 39.40%