Note 12 - Earnings Per Share (Details) - Earnings Per Share Calculation (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator-
Net income available to common shareholders (in Dollars)	$ 79,957	$ 49,217	$ 62,455
Denominator-
Denominator for basic earnings per share – weighted average shares	39,783	39,405	38,643
Effect of dilutive securities-
Employee and director stock options and restricted share awards	1,111	1,101	1,045
Denominator for diluted earnings per share - adjusted weighted average shares and assumed conversions	40,894	40,506	39,688
Basic earnings per common share (in Dollars per share)	$ 2.01	$ 1.25	$ 1.62
Diluted earnings per common share and common share equivalents (in Dollars per share)	$ 1.96	$ 1.22	$ 1.57

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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