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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	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Income	$ 51,778	$ 42,707	$ 46,514
Basic - weighted-average shares outstanding: (in shares)	26,647,610	26,365,173	26,005,858
Effect of dilutive securities:
Employee stock options, restricted stock and other (in shares)	197,461	199,466	314,426
Diluted - weighted-average shares outstanding: (in shares)	26,845,071	26,564,639	26,320,284
Net income per share attributable to common shareholders:
Basic (in dollars per share)	$ 1.94	$ 1.62	$ 1.79
Diluted (in dollars per share)	$ 1.93	$ 1.61	$ 1.77

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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