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Note 2 - Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total $ 551,546   $ 649,433
Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent, Total $ 108,052   $ 108,052
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 23,737 23,737  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 10.00 $ 10.00