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Note 8 - Accounting for Share-based Payment Arrangement Compensation/Excess Tax Benefit Reclassification (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stock or Unit Option Plan Expense			$ 916,000	$ 741,000
Income Tax Expense (Benefit)	$ 5,153,000	$ 6,090,000	17,039,000	17,815,000
Net Cash Provided by (Used in) Operating Activities			94,710,000	104,270,000
Net Cash Provided by (Used in) Financing Activities			10,024,000	35,687,000
Accounting Standards Update 2016-09 [Member]
Income Tax Expense (Benefit)			$ (152,000)
Net Cash Provided by (Used in) Operating Activities				129,000
Net Cash Provided by (Used in) Financing Activities				$ 129,000

X

- Definition

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

+ 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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585

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