Note 2 - Selected Balance Sheet Data - Inventories (Details) - USD ($) $ in Thousands  | 
Mar. 31, 2018  | 
Jun. 30, 2017  | 
|---|---|---|
| Raw materials | $ 29,414 | $ 22,074 | 
| Finished goods | 59,172 | 38,077 | 
| Inventories, net | $ 88,586 | $ 60,151 | 
| X | ||||||||||
- Definition Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
  | 
| X | ||||||||||
- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
  | 
| X | ||||||||||
- Definition Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
  |