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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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