Note 2 - Business Segment Information (Details) - Revenue by Geographic Region - USD ($) $ in Thousands		3 Months Ended												12 Months Ended
		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, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2011
Net Sales (a):
Net sales		$ 76,073	$ 68,603	$ 84,715	$ 78,466	$ 73,858	$ 68,996	$ 76,123	$ 80,486	$ 68,837	$ 66,152	$ 71,082	$ 74,719	$ 307,857	[1]	$ 299,463	[1]	$ 280,790	[1]	$ 268,402	$ 293,501
UNITED STATES
Net Sales (a):
Net sales	[1]													307,816		298,089		279,818
CANADA
Net Sales (a):
Net sales	[1]													$ 41		$ 1,374		$ 972

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