Note 2 - Significant Accounting Policies (Details Textual) - USD ($)	6 Months Ended	15 Months Ended
	Dec. 31, 2022	Dec. 31, 2023	Jun. 30, 2023
Contract with Customer, Asset, after Allowance for Credit Loss, Current		$ 150,180	$ 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