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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	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Income	$ 76,588	$ 51,778	$ 42,707
Basic - weighted-average shares outstanding: (in shares)	26,982,614	26,647,610	26,365,173
Employee stock options and other (in shares)	296,202	197,461	199,466
Diluted - weighted-average shares outstanding: (in shares)	27,278,816	26,845,071	26,564,639
Basic (in dollars per share)	$ 2.84	$ 1.94	$ 1.62
Diluted (in dollars per share)	$ 2.81	$ 1.93	$ 1.61

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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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