Note 10 - Business Risk and Credit Risk Concentration Involving Cash (Details Textual) - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Revenue Benchmark [Member]
Number Of Customers	1	2	3	3
Accounts Receivable [Member]
Number Of Customers			1	1