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Note 2 - (Loss) Income Per Share - Calculation of Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net (loss) income	$ (2,213)	$ 4,433
Denominator:
Denominator for basic (loss) income per share – weighted-average shares (in shares)	18,088	18,381
Effect of dilutive securities:
Equivalent shares issuable upon conversion of unvested restricted shares (in shares)		152
Diluted weighted average shares outstanding (in shares)	18,088	18,533
Income per share:
Basic and diluted (loss) income per share (in dollars per share)	$ (0.12)	$ 0.24

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