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Note 13 - Employee Benefit Plans (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Employee Stock Ownership Plan (ESOP), Compensation Expense	$ 5,488,000	$ 6,278,000	$ 4,496,000
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 1,056,000	804,000	453,000
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	95.00%
Allocated Share-based Compensation Expense	$ 5,451,000	4,018,000	$ 1,366,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	842,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 7,800,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 219 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 9,128,000	$ 6,552,000
Share Price	$ 62.15
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	63,712	71,368	64,720
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 2,031,000	$ 2,054,000	$ 957,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 11.64	$ 7.81
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	58,000	375,000	0
Employee Stock Purchase Plan 2011 [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	25000.00%
Special Employee Stock Purchase Plan 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	85.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount	$ 10,000

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
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-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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No definition available.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

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Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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- Definition

The amount of plan compensation cost recognized during the period.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Purchase price of common stock expressed as a percentage of its fair value.

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

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