Note 4 - Acquisitions - Pro Forma Financial Information (Details) - USD ($) $ in Thousands  | 
12 Months Ended | |
|---|---|---|
Jun. 30, 2017  | 
Jun. 30, 2016  | 
|
| Net sales | $ 564,220 | $ 523,840 | 
| Net income | $ 99,380 | $ 110,536 | 
| X | ||||||||||
- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  | 
| X | ||||||||||
- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  |