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Note 2 - Summary of Significant Accounting Policies - Reconciliation of Numerators and Denominators of EPS Calculation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Net loss	$ (19,193)	$ (22,678)	$ (19,193)	$ (22,678)
Weighted-average shares of common stock outstanding (in shares)			28,293	24,991
Weighted-average shares subject to repurchase (in shares)			(1,090)	(1,112)
Shares used in per-share calculation - basic (in shares)	27,203,000	23,879,000	27,203	23,879
Shares used in per-share calculation - diluted (in shares)	27,203,000	23,879,000	27,203	23,879
Net loss per share - basic (in dollars per share)	$ (0.71)	$ (0.95)	$ (0.71)	$ (0.95)
Net loss per share - diluted (in dollars per share)	$ (0.71)	$ (0.95)	$ (0.71)	$ (0.95)

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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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-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e2646-109256

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- Definition

This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 13
-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e2646-109256

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X

- Definition

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)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e1448-109256

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Period Type:	duration