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Note 2 - Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Jun. 30, 2023
Contract with Customer, Asset, after Allowance for Credit Loss, Current $ 147,520   $ 186,959
Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent $ 108,052   $ 108,052
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 23,737 23,737  
Maximum [Member]      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 10 $ 10