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Note 5 - Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income	$ 49,746	$ 46,090	$ 150,102	$ 127,084
Weighted-average shares:
Basic weighted-average number of common shares outstanding (in shares)	80,665,398	78,865,860	80,073,249	79,147,839
Dilutive effect of weighted-average outstanding common share equivalents
Diluted weighted-average number of common shares outstanding (in shares)	81,404,854	79,697,069	80,797,179	79,902,846
Average stock options and warrants with anti-dilutive effect (in shares)	0	207,183	6,561	247,974
Basic (in dollars per share)	$ 0.62	$ 0.58	$ 1.87	$ 1.61
Diluted (in dollars per share)	$ 0.61	$ 0.58	$ 1.86	$ 1.59
Warrant [Member]
Dilutive effect of weighted-average outstanding common share equivalents
Warrants (in shares)	399,957	569,949	409,019	520,686
Employee Stock Option [Member]
Dilutive effect of weighted-average outstanding common share equivalents
Warrants (in shares)	19,221	95,850	25,706	90,461
Restricted Stock Units (RSUs) [Member]
Dilutive effect of weighted-average outstanding common share equivalents
Warrants (in shares)	320,278	165,410	289,205	143,860

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