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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
	Mar. 31, 2018	Mar. 31, 2017
Net income	$ 18,051	$ 12,200
Basic - weighted-average shares outstanding: (in shares)	26,879,388	26,466,731
Effect of dilutive securities:
Employee stock awards and other (in shares)	317,711	132,469
Diluted - weighted-average shares outstanding: (in shares)	27,197,099	26,599,200
Basic (in dollars per share)	$ 0.67	$ 0.46
Diluted (in dollars per share)	$ 0.66	$ 0.46

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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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