Note 7 - Equity-based Compensation (Details) - Summary of Stock Option Activity (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at January 1, 2013	1,208,824	1,216,809	1,107,712
Outstanding at January 1, 2013 (in Dollars per share)	$ 18.54	$ 18.46	$ 18.98
Granted	38,820	29,025	281,696
Granted (in Dollars per share)	$ 24.21	$ 25.11	$ 18.11
Exercised	(526,359)	(29,511)	(52,676)
Exercised (in Dollars per share)	$ 16.36	$ 20.14	$ 16.66
Canceled/Expired	(218,151)	(7,499)	(119,923)
Canceled/Expired (in Dollars per share)	$ 25.61	$ 24.58	$ 23.21
Outstanding at December 31, 2013	503,134	1,208,824	1,216,809
Outstanding at December 31, 2013 (in Dollars per share)	$ 18.18	$ 18.54	$ 18.46
Exercisable at December 31, 2013	452,236	933,738	758,270
Exercisable at December 31, 2013 (in Dollars per share)	$ 18.12	$ 17.84	$ 16.80
Expense recorded	$ 3,600,000	$ 3,000,000	$ 4,100,000
Unrecognized pre-tax expense	11,200,000
Remaining period for recognition	2 years 0 months 18 days
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options, General Term	7 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options, General Term	10 years
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recorded	600,000	1,700,000	2,100,000
Unrecognized pre-tax expense	$ 100,000
Remaining period for recognition	1 year 0 months 15 days

General term of stock options

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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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Unrecognized cost of unvested share-based compensation awards.

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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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- 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.

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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.

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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.

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

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

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

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