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Note 10 - Income Tax (Details Textual) - USD ($) Pure in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2023
Unrecognized Tax Benefits	$ 3,889	$ 0	$ 0	$ 1,915
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 2,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	0.00%	0.00%	0.00%
Operating Loss Carryforwards	$ 13,300	$ 20,900
Open Tax Year	2017 2018 2019 2020 2021 2022

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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- Definition

Tax year that remains open to examination under enacted tax laws, in YYYY format.

+ References

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-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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-Name Accounting Standards Codification
-Topic 740
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-Section 50
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Amount of unrecognized tax benefits.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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