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Note 3 - Net Income Per Common Share - Computation of Basic and Diluted Net Income 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	$ 13,220	$ 11,982	$ 37,506	$ 33,335
Basic - weighted-average shares outstanding: (in shares)	26,617,349	26,416,041	26,600,174	26,334,738
Employee stock options and other (in shares)	184,685	193,837	116,379	204,340
Diluted - weighted-average shares outstanding: (in shares)	26,802,034	26,609,878	26,716,553	26,539,078
Basic (in dollars per share)	$ 0.50	$ 0.45	$ 1.41	$ 1.27
Diluted (in dollars per share)	$ 0.49	$ 0.45	$ 1.40	$ 1.26

X

- Definition

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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