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Note 10 - Income Taxes (Details) - Effective Income Tax Rate Reconciliation - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Effective Income Tax Rate Reconciliation [Abstract]                      
Taxes at federal statutory rate                 $ 25,681 $ 25,484 $ 21,248
Taxes at federal statutory rate                 35.00% 35.00% 35.00%
Increase (reduction) in taxes resulting from:                      
State and local income tax, net of Federal income tax benefit                 $ 3,461 $ 4,980 $ 3,648
State and local income tax, net of Federal income tax benefit                 4.70% 6.80% 6.00%
Other                 $ (1,975) $ (1,891) $ (1,940)
Other                 (2.70%) (2.60%) (3.20%)
Taxes at effective rate $ 5,439 $ 6,661 $ 9,521 $ 5,546 $ 6,988 $ 7,060 $ 7,598 $ 6,927 $ 27,167 $ 28,573 $ 22,956
Taxes at effective rate                 37.00% 39.20% 37.80%