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Note 18 - Subsequent Events (Details Textual)
$ / shares in Units, $ in Thousands
Apr. 27, 2023
USD ($)
$ / shares
shares
Apr. 26, 2023
$ / shares
shares
Mar. 31, 2023
$ / shares
Dec. 31, 2022
$ / shares
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares     $ 7.70 $ 7.70
Subsequent Event [Member]        
Proceeds from Issuance of Private Placement | $ $ 3,000      
Subsequent Event [Member] | Series B Preferred Stock and Series C Preferred Stock [Member]        
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares $ 1.30 $ 6.30    
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) 770 159    
Preferred Stock, Convertible, Increase in Shares Issuable (in shares) 7,863,570      
Subsequent Event [Member] | Ladenburg Thalmann and Co. Inc. [Member]        
Private Placement, Placement Agent Fee, Percentage of Gross Proceeds 8.00%      
Payments of Stock Issuance Costs, Reimbursement of Expenses | $ $ 55      
Subsequent Event [Member] | Series B-1 Warrant [Member]        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 2,538,464      
Warrants and Rights Outstanding, Term (Year) 5 years      
Subsequent Event [Member] | Series B-2 Warrant [Member]        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 2,538,464      
Warrants and Rights Outstanding, Term (Year) 2 years      
Subsequent Event [Member] | Warrant Amendment Agreements [Member]        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 1,724,455      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 1.30 $ 6.30    
Subsequent Event [Member] | Series B-1 and B-2 Warrants [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 1.30      
Subsequent Event [Member] | Original Issue Discount Senior Secured Convertible Debentures Due November 1, 2024 [Member]        
Debt Instrument, Face Amount | $ $ 3,300      
Debt Instrument, Convertible, Number of Equity Instruments 2,538,464      
Maximum Percentage of Common Stock Outstanding 19.99%      
Debt Instrument, Convertible, Maximum Issuable Shares Per Holder (in shares) 438,669      
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares $ 1.30      
Debt Instrument, Monthly Redemption, Aggregate Principal Amount 0.556      
Debt Instrument, Monthly Redemption, Multiplier in Cash 1.10      
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 90.00%      
Debt Instrument, Convertible, Threshold Trading Days 10      
Debt Instrument, Default, Interest Rate 18.00%