Note 3 - Revenue from Contracts with Customers - Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Net sales	$ 51,901	$ 51,818
North American Segment [Member]
Net sales	30,200	29,718
International Segment [Member]
Net sales	21,701	22,100
UNITED STATES | North American Segment [Member]
Net sales	27,947	27,459
Canada and Mexico [Member] | North American Segment [Member]
Net sales	2,253	2,259
BRAZIL | International Segment [Member]
Net sales	12,367	12,796
UNITED KINGDOM | International Segment [Member]
Net sales	6,017	6,182
CHINA | International Segment [Member]
Net sales	1,708	1,745
Australia and New Zealand [Member] | International Segment [Member]
Net sales	$ 1,609	$ 1,377