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Note 2 - Basis of Presentation, Principles of Consolidation, and Significant Accounting Policies (Details Textual) $ in Thousands, shares in Millions		12 Months Ended
	Jan. 29, 2021	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares
Number of Operating Segments		1
Net Income (Loss) Attributable to Parent, Total		$ (29,025)	$ (15,894)
Net Cash Provided by (Used in) Operating Activities, Total		(27,639)	(18,951)
Retained Earnings (Accumulated Deficit), Total		(101,835)	(72,810)
Cash and Cash Equivalents, at Carrying Value, Total		43,145	$ 70,903
Legal Fees		$ 2,400
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares		5.5	4.3
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	6

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