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Note 15 - Share Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended			48 Months Ended	72 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2017	Feb. 10, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized						9,100,000
Allocated Share-based Compensation Expense	$ 10,205	$ 9,493	$ 8,241
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 40.13	$ 33.24	$ 45.18
Proceeds from Stock Options Exercised	$ 6,951	$ 1,623
Payments Related to Tax Withholding for Share-based Compensation	$ 5,892	$ 14,008	$ 12,956
Board of Directors Chairman [Member]
Deferred Compensation Arrangement with Individual, Shares Issued	34,095	19,326	16,260
Deferred Compensation Arrangement with Individual, Shares Vested	22,762	19,326	16,260
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 1,133	$ 670	$ 615
Employee Stock Option [Member]
Allocated Share-based Compensation Expense	$ 4,503	$ 4,366	$ 4,198
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Shares Paid for Tax Withholding for Share Based Compensation	9,033	473,743	272,296
Proceeds from Stock Options Exercised	$ 6,951	$ 1,623
Payments Related to Tax Withholding for Share-based Compensation	4,301	13,056	$ 9,768
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 8,552			$ 8,552	$ 8,552
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 182 days
Restricted Stock [Member]
Allocated Share-based Compensation Expense	$ 5,702	$ 5,127	$ 4,043
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					3 years
Shares Paid for Tax Withholding for Share Based Compensation	39,500	28,593	65,763
Payments Related to Tax Withholding for Share-based Compensation	$ 1,591	$ 952	$ 3,233
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 7,702			$ 7,702	$ 7,702
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 255 days
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Performance Measurement, Period				3 years
Minimum [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 40.12	$ 33.23	$ 28.36
Performance Share Award, Percentage	0.00%			0.00%	0.00%
Maximum [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 48.98	$ 35.37	$ 49.70
Performance Share Award, Percentage	200.00%			200.00%	200.00%

X

- Definition

Number of shares vested during the period pursuant to the terms of a deferred compensation arrangement.

+ References

No definition available.

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X

- Definition

The percentage of the target performance share award.

+ References

No definition available.

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X

- Definition

Period of performance measurement for share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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X

- Definition

Number of shares issued pursuant to the terms of a deferred compensation arrangement.

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X

- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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-Name Accounting Standards Codification
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- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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X

- Definition

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

+ References

No definition available.

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X

- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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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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