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Note 16 - Warrants (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2025
Sep. 23, 2025
Sep. 30, 2024
Proceeds from Warrant Exercises   $ 3,500        
Stock Issued During Period, Shares, Warrants Exercised (in shares)   367,478        
Other Nonoperating Income (Expense)       $ 201   $ 542
Class of Warrant or Right, Outstanding (in shares)       13,195,669    
June 2025 Equity Financing [Member]            
Proceeds from Issuance or Sale of Equity $ 16,600          
December 2020 Warrants, January 2022 Warrants, March 2022 Warrants, and August 2022 Warrants [Member]            
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)       1    
June 2023 Tranche A Warrants [Member]            
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)     1      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     2,173,912      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 1.59 $ 1.59 [1]    
Class of Warrant or Right, Exercise Price of Warrants or Rights to Prefunded Warrants (in dollars per share)     $ 1.5899      
Class of Warrant or Right, Expiration, Threshold Number of Trading Days (Day)     30 days      
Class of Warrant or Right, Expiration, Threshold Percentage of Exercise Price     200.00%      
Class of Warrant or Right, Expiration, Threshold Exercise Price (in dollars per share)     $ 3.18      
Class of Warrant or Right, Expiration, Threshold Consecutive Trading Days (Day)     40 days      
Class of Warrant or Right, Outstanding (in shares) [1]       2,173,912    
June 2023 Tranche A Prefunded Warrants [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 0.0001      
June 2023 Tranche B Prefunded Warrants [Member]            
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)   1        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.0001   $ 0.0001 [2]    
Class of Warrant or Right, Issued During Period (in shares)   1,806,434        
Warrants and Rights Outstanding   $ 5,100        
Class of Warrant or Right, Outstanding (in shares) [2]       1,630,434    
June 2023 Prefunded Warrants [Member]            
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)       1    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) [3]       $ 0.0001    
Class of Warrant or Right, Outstanding (in shares) [3]       430,217    
June 2025 Prefunded Warrants [Member]            
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) 1          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) [4]       $ 0.0001    
Stock Issued During Period, Shares, Warrants Exercised (in shares)         935,000  
Warrants and Rights Outstanding $ 12,300          
Other Nonoperating Income (Expense) $ 1,300          
Class of Warrant or Right, Outstanding (in shares) [4]       7,298,332    
Class of Warrant or Right, Exercised During Period (in shares)         935,000  
Liability Warrants [Member]            
Class of Warrant or Right, Outstanding (in shares) 3,821,115          
Equity Warrants [Member]            
Class of Warrant or Right, Outstanding (in shares)       15,571    
[1] In June 2023, the Company issued these tranche A warrants to purchase 2,173,912 shares of common stock (the “Tranche A Warrants”), which may be exercised on a one-for-one basis at any time subject to certain limitations as defined in the agreements between the Company and the investors, for either shares of common stock at an exercise price of $1.59 per share or for prefunded warrants at an exercise price of $1.5899 per prefunded warrant to purchase common stock at a future exercise price of $0.0001 per share. The Tranche A Warrants will expire upon the earlier of June 2028 or 30 days following the closing price of the Company’s common stock equaling 200% of the exercise price ($3.18 per share) for at least 40 consecutive trading days.
[2] In June 2024, certain warrants were exercised, generating proceeds of $3.5 million, into 367,478 shares of common stock and 1,806,434 prefunded warrants to purchase shares of common stock with an exercise price of $0.0001 per share (the “Tranche B Prefunded Warrants”), and may be exercised at any time subject to certain limitations as defined in the agreements between the Company and the investors on a one-for-one basis. The Tranche B Prefunded Warrants had a fair value of approximately $5.1 million at issuance and are classified as derivative warrant liabilities, with the offset in additional paid in capital in stockholders’ equity in the Company’s consolidated financial statements.
[3] Each of these prefunded warrants is exercisable at any time for one share of the Company’s common stock on a one-for-one basis under the terms of the agreements between the Company and the investors.
[4] In June 2025, the Company raised gross proceeds of $16.6 million from the issuance of the June 2025 Common Stock and the June 2025 Prefunded Warrants. The June 2025 Prefunded Warrants may be exercised on a one-for-one basis at any time subject to certain limitations as defined in the agreements between the Company and the investors. The June 2025 Prefunded Warrants had a fair value of approximately $12.3 million at issuance and are classified as derivative warrant liabilities. There was $1.3 million of issuance costs allocated to the June 2025 Prefunded Warrants. See Note 12 - Fair Value Measurements and Note 14 - Stockholders’ Equity for further detail.