Note 6 - Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Beginning balance			$ 949,627
Other comprehensive income (loss)	$ 40,956	$ 1,925	33,073	$ 5,111
Ending balance	1,058,292		1,058,292
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Beginning balance			18,989
Other comprehensive income (loss)			22,286
Ending balance	41,275		41,275
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Beginning balance			(67,924)
Other comprehensive income (loss)			10,787
Ending balance	(57,137)		(57,137)
AOCI Attributable to Parent [Member]
Beginning balance			(48,935)
Other comprehensive income (loss)			33,073
Ending balance	$ (15,862)		$ (15,862)