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Note 8 - Earnings per share (Details) - Earnings Per Share, Basic and Diluted (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share, Basic and Diluted [Abstract]
Net income available to common stockholders (in Dollars)	$ 18,156	$ 8,473	$ 32,206	$ 15,586
Weighted average number of common shares outstanding	43,334,441	41,319,057	43,132,398	41,316,958
Effect of stock options	27,114	143,537	24,429	160,906
Weighted average diluted number of common shares outstanding	43,361,555	41,462,594	43,156,827	41,477,864
Basic earnings per share (in Dollars per share)	$ 0.42	$ 0.21	$ 0.75	$ 0.38
Diluted earnings per share (in Dollars per share)	$ 0.42	$ 0.20	$ 0.75	$ 0.38

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

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The amount of net income (loss) for 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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