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Note 14 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended
Jun. 30, 2025
Sep. 30, 2025
Sep. 28, 2021
Jun. 17, 2020
Preferred Stock, Shares Authorized (in shares) 50,000,000 50,000,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) $ 0.0001 $ 0.0001    
Preferred Stock, Shares Issued (in shares) 0 0    
Common Stock, Shares Authorized (in shares) 200,000,000 200,000,000    
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.0001 $ 0.0001    
Common Stock, Shares, Issued (in shares) 8,976,913 9,911,913    
Common Stock, Shares, Outstanding (in shares) 8,976,913 9,911,913    
Preferred Stock, Shares Outstanding (in shares) 0 0    
Pre-Funded Warrants [Member]        
Class of Warrant or Right, Issued During Period (in shares) 8,233,332      
Class of Warrant or Right, Offering Price (in dollars per share) $ 1.4999      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 8,233,332      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 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      
Proceeds from Issuance or Sale of Equity, Net $ 14.8      
Restricted Stock [Member]        
Common Stock, Shares, Outstanding (in shares)   31,298