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Note 10 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Taxes at federal statutory rate									$ 23,147	$ 37,106	$ 25,681
Taxes at federal statutory rate, percentage									35.00%	35.00%	35.00%
Increase (reduction) in taxes resulting from:
State and local income tax, net of Federal income tax benefit									$ 1,410	$ 4,890	$ 3,461
State and local income tax, net of Federal income tax benefit, percentage									2.10%	4.60%	4.70%
TCJA									$ 3,770
TCJA, percentage									5.70%
Other									$ (3,314)	$ (893)	$ (1,975)
Other, percentage									(5.00%)	(0.80%)	(2.70%)
Total provision for income taxes	$ 7,693	$ 5,291	$ 6,775	$ 5,254	$ 8,116	$ 6,655	$ 20,717	$ 5,615	$ 25,013	$ 41,103	$ 27,167
Taxes at effective rate, percentage									37.80%	38.80%	37.00%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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