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Note 2 - Significant Accounting Policies (Details Textual) - USD ($)
Sep. 30, 2025
Jun. 30, 2025
Sep. 30, 2024
Contract with Customer, Asset, after Allowance for Credit Loss, Current $ 242,078 $ 428,585  
Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent $ 0    
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.01 $ 0.01  
Maximum [Member]      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 10   $ 10