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Note 10 - Treasury Stock (Details Textual) - USD ($) $ in Thousands	3 Months Ended		39 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017	Jul. 01, 2015
Stock Repurchase Program, Authorized Amount					$ 250,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased					600,000
Treasury Stock, Shares, Acquired	3,311		169,144
Treasury Stock, Value, Acquired, Cost Method	$ 2,295		$ 75,600
Payments Related to Tax Withholding for Share-based Compensation	$ 7,199	$ 331
Shares Paid for Tax Withholding for Share Based Compensation	9,767
Treasury Stock, Shares, Ending Balance	155,458		155,458	156,457

X

- Definition

Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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-SubTopic 10
-Section 25
-Paragraph 19A
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Balance Type:	credit
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X

- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

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X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

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X

- Definition

Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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X

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

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-Publisher FASB
-Name Accounting Standards Codification
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X

- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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