Note 2 - Revenue by Geographic Region (Details) - USD ($) $ in Thousands		3 Months Ended												12 Months Ended
		Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2012
UNITED STATES
Revenue, Net	[1]													$ 322,196		$ 307,816		$ 298,089
CANADA
Revenue, Net	[1]															41		1,374
Revenue, Net		$ 80,844	$ 70,740	$ 84,687	$ 85,925	$ 76,073	$ 68,603	$ 84,715	$ 78,466	$ 73,858	$ 68,996	$ 76,123	$ 80,486	$ 322,196	[1]	$ 307,857	[1]	$ 299,463	[1]	$ 280,790	$ 268,402

[1] Net sales are attributed to geographic areas based upon the location of the operation making the sale.