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Note 14 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Sep. 23, 2025
Dec. 31, 2024
Jun. 30, 2025
Sep. 15, 2025
Sep. 28, 2021
Jun. 17, 2020
Preferred Stock, Shares Authorized (in shares) 50,000,000 50,000,000     50,000,000      
Preferred Stock, Par or Stated Value Per Share (in dollars per share) $ 0.0001 $ 0.0001     $ 0.0001      
Preferred Stock, Shares Issued (in shares) 0 0     0      
Preferred Stock, Shares Outstanding (in shares) 0 0     0      
Common Stock, Shares Authorized (in shares) 200,000,000 200,000,000     200,000,000      
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.0001 $ 0.0001     $ 0.0001      
Common Stock, Shares, Issued (in shares) 8,976,913 5,972,638     8,976,913      
Common Stock, Shares, Outstanding (in shares) 8,976,913 5,972,638     8,976,913      
Stock Issued During Period, Shares, Warrants Exercised (in shares)   367,478            
Pre-Funded Warrants [Member]                
Class of Warrant or Right, Issued During Period (in shares) 8,233,332       8,233,332 [1],[2]      
Class of Warrant or Right, Offering Price (in dollars per share) $ 1.4999       $ 1.4999      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 8,233,332       8,233,332      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.0001       $ 0.0001      
Class of Warrant or Right, Exercised During Period (in shares)       176,000 176,000      
June 2025 Prefunded Warrants [Member]                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) [3] $ 0.0001       $ 0.0001      
The 2020 Shelf [Member]                
Sale of Stock, Maximum Amount of Equity Issuable               $ 100.0
The 2021 Shelf [Member]                
Sale of Stock, Maximum Amount of Equity Issuable             $ 100.0  
Public Offering [Member]                
Proceeds from Issuance or Sale of Equity $ 16.6              
Stock Issued During Period, Shares, New Issues (in shares) 2,806,688              
Shares Issued, Price Per Share (in dollars per share) $ 1.5       $ 1.5      
Proceeds from Issuance or Sale of Equity, Net $ 14.8              
Restricted Stock [Member]                
Common Stock, Shares, Outstanding (in shares) 32,916       32,916      
Subsequent Event [Member]                
Common Stock, Shares, Issued (in shares)           9,911,913    
Common Stock, Shares, Outstanding (in shares)           9,911,913    
Subsequent Event [Member] | June 2025 Prefunded Warrants [Member]                
Class of Warrant or Right, Exercised During Period (in shares)     935,000          
Stock Issued During Period, Shares, Warrants Exercised (in shares)     935,000          
[1] From July 2025 through the filing of this report, a total of 935,000 of the June 2025 Prefunded Warrants were exercised to 935,000 shares of common stock. See Note 14 - Stockholders’ Equity for further detail.
[2] Relates to the June 2025 issuance of 8,233,332 prefunded warrants at a public offering price of $1.4999 to purchase 8,233,332 shares of the Company’s common stock at an exercise price of $0.0001 per share.
[3] In June 2025, the Company raised gross proceeds of $16.6 million from the issuance of the June 2025 Common Stock 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, with the offset in additional paid in capital in stockholders’ equity in the Company’s consolidated financial statements. There was $1.3 million of issuance costs allocated to the June 2025 Prefunded Warrants, which were recorded in other (expense) income in the consolidated statement of operations. See Note 12 - Fair Value Measurements and Note 14 - Stockholders’ Equity for further detail.