Note 7 - Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
 
 
Unrealized
Gains
(Losses) on
Available-
for-Sale
Investments
 
 
Foreign
Currency
Translation
Adjustments
 
 
Total
 
Beginning balance
   $ (5,542
)
   $ (64,863
)
   $ (70,405
)
Other comprehensive income
     9,714       (3,234
)
     6,480  
Ending balance
   $ 4,172     $ (68,097
)
   $ (63,925
)