Note 8 - Stock Retired and Repurchased (Details) - USD ($)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Common shares repurchased (in shares)	697,799	645,831
Cost to repurchase common shares	$ 19,346,104	$ 16,469,725
Average price per share (in dollars per share)	$ 27.72	$ 25.50