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Note 14 - Subsequent Events (Details Textual)
$ in Millions, $ in Millions
1 Months Ended 3 Months Ended 11 Months Ended
Apr. 01, 2024
USD ($)
shares
Apr. 01, 2024
USD ($)
shares
Apr. 01, 2024
USN ($)
shares
Feb. 26, 2024
shares
Jul. 31, 2023
shares
Mar. 31, 2024
USD ($)
Dec. 13, 2023
shares
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation       36     193
Stock Issued During Period, Shares, New Issues       495,959 63,422    
Prefunded Warrant [Member]              
Number of Warrants Per Unit 1 1 1        
Series A Warrant [Member]              
Number of Warrants Per Unit 1 1 1        
Private Placement [Member]              
Equity Offering, Number of Units Sold   2,532,285 2,532,285        
Number of Shares Per Unit 1 1 1        
Proceeds From Issuance or Sale of Equity, Gross     $ 50.0     $ 50.0  
Proceeds from Issuance or Sale of Equity | $     $ 99.4        
Subsequent Event [Member]              
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation       36      
Stock Issued During Period, Shares, New Issues       495,959      
Subsequent Event [Member] | Prefunded Warrant [Member]              
Number of Warrants Per Unit 1 1 1        
Subsequent Event [Member] | Series A Warrant [Member]              
Number of Warrants Per Unit 1 1 1        
Subsequent Event [Member] | Private Placement [Member]              
Equity Offering, Number of Units Sold 2,532,285 2,532,285 2,532,285        
Number of Shares Per Unit 1 1 1        
Proceeds From Issuance or Sale of Equity, Gross | $ $ 50.0            
Proceeds from Issuance or Sale of Equity | $ $ 99.4 $ 99.4