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Note 19 - New Accounting Standards (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stockholders' Equity, Effects of Tax Law Changes
Income Tax Expense (Benefit)		61,983	$ 46,624	$ 32,900
Accounting Standards Update 2016-09 [Member]
Income Tax Expense (Benefit)		(1,700)
Retained Earnings [Member]
Stockholders' Equity, Effects of Tax Law Changes		$ 3,016
Retained Earnings [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member]
Stockholders' Equity, Effects of Tax Law Changes	$ 3,000

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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