| Note 6 - Leases - Cash Paid (Details) $ in Thousands | 3 Months Ended | 
|---|---|
| Sep. 30, 2020  USD ($) | |
| Cash amounts paid on operating lease liabilities | $ 3,230 | 
| Right of use assets obtained in exchange for lease liabilities | $ 706 | 
| X | ||||||||||
| 
- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
 | 
| X | ||||||||||
| 
- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
 |