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Note 14 - Employee Benefit Plans (Details Textual)		12 Months Ended
	Feb. 08, 2018	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
Employee Stock Ownership Plan (ESOP), Compensation Expense		$ 6,343,000	$ 5,488,000	$ 6,278,000
Deferred Compensation Arrangement with Individual, Compensation Expense		$ 1,596,000	1,056,000	804,000
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent		95.00%
Allocated Share-based Compensation Expense		$ 11,763,000	$ 5,451,000	$ 4,018,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options		264,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options		$ 23,300,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		2 years 109 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		$ 5,342,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value		$ 4,761,000
Share Price | $ / shares		$ 28.55
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | shares		122,012	127,424	142,736
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 1,329,000	$ 2,031,000	$ 2,054,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares		0	116,000	750,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares			$ 5.82	$ 3.91
Subsequent Event [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	2
Employee Stock Purchase Plan 2011 [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount		$ 25,000
Special Employee Stock Purchase Plan 2015 [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount		$ 10,000
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent		85.00%

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.

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

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Maximum amount the employee may contribute to a defined contribution plan.

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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.

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Unrecognized cost of unvested options awarded to employees as compensation.

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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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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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