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Note 2 - Income Per Share - Calculation of Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income	$ 11,614	$ 4,632	$ 26,002	$ 6,141
Basic weighted average shares outstanding (in shares)	18,343	18,288	18,337	18,275
Equivalent shares issuable upon conversion of unvested restricted stock (in shares)	154	116	111	91
Denominator for diluted earnings per share – adjusted weighted-average shares and assumed conversions (in shares)	18,497	18,404	18,448	18,366
Basic income per share: (in dollars per share)	$ 0.63	$ 0.25	$ 1.42	$ 0.34
Diluted income per share: (in dollars per share)	$ 0.63	$ 0.25	$ 1.41	$ 0.33

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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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