Note 6 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2016 |
|
| Operating Leases, Rent Expense, Net, Total | $ 10.8 | $ 9.8 | $ 8.1 |
| X | ||||||||||
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|