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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				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income	$ 2,557	$ 5,095	$ 12,915	$ 3,712	$ 7,652	$ 16,627
Basic - weighted-average shares outstanding: (in shares)	27,530,739		27,735,732		27,515,583	27,600,684
Employee stock options and other (in shares)	6,084		9,138		8,436	140,780
Diluted - weighted-average shares outstanding: (in shares)	27,536,823		27,744,870		27,524,019	27,741,464
Basic (in dollars per share)	$ 0.09		$ 0.47		$ 0.28	$ 0.60
Diluted (in dollars per share)	$ 0.09		$ 0.47		$ 0.28	$ 0.60

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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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-SubTopic 10
-Section 50
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
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-Name Accounting Standards Codification
-Topic 260
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-Section 45
-Paragraph 16
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
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