Note 10 - Share-based Compensation - Equity-based Compensation Expenses Related to Performance-based Shares (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2016 |
|
| Total expense | $ 1,000 | $ 1,300 | $ 2,400 |
| Restricted Stock Units (RSUs) [Member] | |||
| Total expense | 537 | 806 | |
| Granted Within the Fiscal Year Ended June 30, 2016 [Member] | Restricted Stock Units (RSUs) [Member] | |||
| Total expense | 92 | 794 | |
| Granted Within the Fiscal Year Ended June 30, 2017 [Member] | Restricted Stock Units (RSUs) [Member] | |||
| Total expense | (12) | 12 | |
| Granted Within the Fiscal Year Ended June 30, 2018 [Member] | Restricted Stock Units (RSUs) [Member] | |||
| Total expense | $ 457 | ||