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Note 2 - Warrant Liability and Fair Value of Financial Instruments (Details Textual)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jul. 07, 2023
USD ($)
$ / shares
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Jan. 29, 2024
USD ($)
shares
Dec. 31, 2023
$ / shares
Gain (Loss) on Derivative Instruments, Net, Pretax   $ (0) $ (4,556)    
Fair Value Adjustment of Warrants   (0) $ 3,444    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares         $ 0.02
The Warrant [Member] | Termination Agreement [Member]          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 0.02        
Class of Warrant or Right, Value of Securities Called by Warrants or Rights $ 8,000        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares       80,000  
Warrants and Rights Outstanding       $ 8,000  
Measurement Input, Probability Rate [Member] | Valuation, Probability-weighted Expected Return Method (PWERM) [Member] | Qualified Offering Occurring, One [Member]          
Warrants and Rights Outstanding, Measurement Input 0.70 [1]       0.70
Measurement Input, Probability Rate [Member] | Valuation, Probability-weighted Expected Return Method (PWERM) [Member] | Qualified Offering Occurring, Two [Member]          
Warrants and Rights Outstanding, Measurement Input 0.10 [1]       0.10
Measurement Input, Probability Rate [Member] | Valuation, Probability-weighted Expected Return Method (PWERM) [Member] | No Qualified Offering Occurring [Member]          
Warrants and Rights Outstanding, Measurement Input 0.20 [1]       0.20
Fair Value, Inputs, Level 3 [Member]          
Assets, Fair Value Disclosure   $ 0      
[1] Scenario probability as of issuance was based on timing expectations of management that a qualified offering occurring as of December 31, 2023 was estimated at 70%, respectively; a qualified offering occurring as of June 30, 2024 was estimated at 10%; and no qualified offering occurring was estimated at 20%;