Note 12 - Business Risk and Credit Risk Concentration Involving Cash (Details Textual) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Mar. 31, 2026
USD ($)
|
Mar. 31, 2025 |
Mar. 31, 2026
USD ($)
|
Mar. 31, 2025 |
|
| Cash, Uninsured Amount | $ 2.2 | $ 2.2 | ||
| Accounts Receivable [Member] | Customer Concentration Risk [Member] | ||||
| Number Of Customers | 1 | 2 | 4 | 3 |