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Note 4 - 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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income	$ 20,937	$ 13,220	$ 57,302	$ 37,506
Basic - weighted-average shares outstanding: (in shares)	27,038,585	26,617,349	26,963,205	26,600,174
Employee stock options and other (in shares)	299,301	184,685	305,106	116,379
Diluted - weighted-average shares outstanding: (in shares)	27,337,886	26,802,034	27,268,311	26,716,553
Basic (in dollars per share)	$ 0.77	$ 0.50	$ 2.13	$ 1.41
Diluted (in dollars per share)	$ 0.77	$ 0.49	$ 2.10	$ 1.40

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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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