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Note 1 - Organization and Significant Accounting Policies - Calculation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net income	$ 28	$ 574	$ 17,028
Denominator (in thousands):
Basic weighted-average common stock outstanding (in shares)	21,932	22,034	21,771
Effect of stock-based awards (in shares)	391	469	790
Diluted weighted-average common stock outstanding (in shares)	22,323	22,503	22,561
Basic net earnings per share (in dollars per share)	$ 0	$ 0.03	$ 0.78
Diluted net earnings per share (in dollars per share)	$ 0	$ 0.03	$ 0.75

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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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