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Note 6 - Earnings (Loss) Per Share - Computation of Basic and Diluted Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net loss	$ (16,062)	$ (15,622)
Basic (in shares)	27,463,321	26,438,071
Diluted (in shares)	27,463,321	26,438,071
Basic (in dollars per share)	$ (0.58)	$ (0.59)
Diluted (in dollars per share)	$ (0.58)	$ (0.59)

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- Definition

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration