Note 3 - Recent Accounting Pronouncements (Details Textual) - Computer Software, Intangible Asset [Member] |
9 Months Ended |
|---|---|
Mar. 31, 2021 | |
| Minimum [Member] | |
| Finite-lived Intangible Assets, Renewal Period (Year) | 1 year |
| Maximum [Member] | |
| Finite-lived Intangible Assets, Renewal Period (Year) | 3 years |