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Note 2 - Significant Accounting Policies - Share-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based compensation expense	$ 1,448	$ 1,040	$ 2,896	$ 1,976
Research and Development Expense [Member]
Share-based compensation expense	979	433	1,969	796
General and Administrative Expense [Member]
Share-based compensation expense	469	534	927	1,046
Cost of Sales [Member]
Share-based compensation expense	$ 0	$ 73	$ 0	$ 134

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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