Note 8 - Income Taxes (Details Textual) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
Mar. 31, 2020 |
Mar. 31, 2019 |
|
| Effective Income Tax Rate Reconciliation, Percent, Total | 58.80% | 24.80% | 23.40% | 25.00% |
| Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | |||
| Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | ||||
| Income Tax Examination, Year under Examination | 2016 2017 2018 | |||