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Note 15 - Stock Based Compensation - Stock Compensation Plans (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Stock Options Outstanding Number of Shares, Balance (in shares) | shares	473
Stock Options Outstanding Weighted Average Exercise Price, Balance (in dollars per share) | $ / shares	$ 42.85
Stock Options Outstanding Number of Shares, Granted (in shares) | shares	0
Stock Options Outstanding Weighted Average Exercise Price, Granted (in dollars per share) | $ / shares
Stock Options Outstanding Number of Shares, Stock Options Exercised (in shares) | shares	(39)
Stock Options Outstanding Weighted Average Exercise Price, Stock Options Exercised (in dollars per share) | $ / shares	$ 32.16
Stock Options Outstanding Number of Shares, Forfeited/Expired (in shares) | shares	(3)
Stock Options Outstanding Weighted Average Exercise Price, Forfeited/Expired (in dollars per share) | $ / shares	$ 44.68
Stock Options Outstanding Number of Shares, Balance (in shares) | shares	431
Stock Options Outstanding Weighted Average Exercise Price, Balance (in dollars per share) | $ / shares	$ 43.82
Stock Options Outstanding Number of Shares, Exercisable (in shares) | shares	325
Stock Options Outstanding Weighted Average Exercise Price,Exercisable (in dollars per share) | $ / shares	$ 43.23
Restricted Stock [Member]
Stock Awards/Units Outstanding Number of Shares, Balance (in shares) | shares	139
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Balance (in dollars per share) | $ / shares	$ 40.96
Stock Awards/Units Outstanding Number of Shares, Granted (in shares) | shares
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Granted (in dollars per share) | $ / shares
Stock Awards/Units Outstanding Number of Shares, Vested (in shares) | shares	(34)
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Vested (in dollars per share) | $ / shares	$ 36.45
Stock Awards/Units Outstanding Number of Shares, Forfeited/Expired (in shares) | shares	(12)
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Forfeited/Expired (in dollars per share) | $ / shares	$ 43.83
Stock Awards/Units Outstanding Number of Shares, Balance (in shares) | shares	93
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Balance (in dollars per share) | $ / shares	$ 42.21
Stock Units [Member]
Stock Awards/Units Outstanding Number of Shares, Balance (in shares) | shares	113
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Balance (in dollars per share) | $ / shares	$ 45.40
Stock Awards/Units Outstanding Number of Shares, Granted (in shares) | shares	185
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Granted (in dollars per share) | $ / shares	$ 58.18
Stock Awards/Units Outstanding Number of Shares, Vested (in shares) | shares	(124)
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Vested (in dollars per share) | $ / shares	$ 52.71
Stock Awards/Units Outstanding Number of Shares, Forfeited/Expired (in shares) | shares	(13)
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Forfeited/Expired (in dollars per share) | $ / shares	$ 51.72
Stock Awards/Units Outstanding Number of Shares, Balance (in shares) | shares	161
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Balance (in dollars per share) | $ / shares	$ 53.97

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(3)
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

Weighted average price of options that were either forfeited or expired.

+ References

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-Name Accounting Standards Codification
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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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Number of share options (or share units) exercised during the current period.

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