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Note 2 - Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Jun. 30, 2024
Contract with Customer, Asset, after Allowance for Credit Loss, Current $ 645,983   $ 645,983     $ 181,680
Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent $ 0   $ 0   $ 0 $ 108,052
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.01   $ 0.01     $ 0.01
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 0 23,737 0 23,737    
Maximum [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 10   $ 10