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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income	$ 18,314	$ 12,086	$ 36,365	$ 24,286
Basic - weighted-average shares outstanding: (in shares)	26,972,990	26,541,978	26,925,673	26,554,262
Employee stock options and other (in shares)	301,892	107,174	306,542	155,955
Diluted - weighted-average shares outstanding: (in shares)	27,274,882	26,649,152	27,232,215	26,710,217
Basic (in dollars per share)	$ 0.68	$ 0.46	$ 1.35	$ 0.91
Diluted (in dollars per share)	$ 0.67	$ 0.45	$ 1.34	$ 0.91

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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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