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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	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Net income	$ 3,951	$ 2,557	$ 5,095	$ 4,835	$ 12,915	$ 3,712	$ 11,603	$ 21,462
Basic - weighted-average shares outstanding: (in shares)	27,505,097			27,713,229			27,512,057	27,638,611
Employee stock options and other (in shares)	3,120			16,876			10,677	69,173
Diluted - weighted-average shares outstanding: (in shares)	27,508,217			27,730,105			27,522,734	27,707,784
Basic (in dollars per share)	$ 0.14			$ 0.17			$ 0.42	$ 0.78
Diluted (in dollars per share)	$ 0.14			$ 0.17			$ 0.42	$ 0.77

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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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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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