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Note 18 - Subsequent Events (Details Textual) - Subsequent Event [Member] - USD ($) $ / shares in Units, $ in Millions	Feb. 27, 2024	Feb. 22, 2024	Jan. 18, 2024
Registered Direct Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)		817,748
Shares Issued, Price Per Share (in dollars per share)		$ 1.465
Maximum Percentage of Outstanding Stock, Beneficial Ownership		4.99%
Proceeds from Issuance or Sale of Equity	$ 1.2
Registered Direct Offering [Member] \| Maximum [Member]
Maximum Percentage of Outstanding Stock, Beneficial Ownership		9.99%
Registered Direct Offering [Member] \| The 2024 Investor Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		817,748
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 1.34
H.C. Wainwright & Co., LLC [Member]
Placement Agent Fee, Percentage of Gross Proceeds		7.00%
Management Fee, Percentage of Gross Proceeds		1.00%
H.C. Wainwright & Co., LLC [Member] \| Placement Agent Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		57,242
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 1.8313
Secured Subordinated Convertible Notes [Member] \| EW and EW-A [Member]
Proceeds from Convertible Debt			$ 2,000.0
Debt Instrument, Default, Increase in Interest Rate			4.00%
Debt Instrument, Convertible, Conversion Ratio			799.3605
Debt Instrument, Face Amount			$ 1.0
Debt Instrument, Convertible, Conversion Price (in dollars per share)			$ 1.251
Secured Subordinated Convertible Notes [Member] \| EW and EW-A [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate			8.50%