Note 3 - Revenue From Contracts With Customers - Revenue From Contracts With Customers (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Mar. 31, 2020		Mar. 31, 2019		Mar. 31, 2020		Mar. 31, 2019
Net sales	$ 49,998	[1]	$ 58,498	[2]	$ 158,976	[3]	$ 166,931	[4]
North American Segment [Member]
Net sales	33,369	[1]	36,069	[2]	97,475	[3]	100,897	[4]
International Segment [Member]
Net sales	16,629		22,429		61,501		66,034
UNITED STATES | North American Segment [Member]
Net sales	31,288		33,915		90,996		94,275
Canada and Mexico [Member] | North American Segment [Member]
Net sales	2,081		2,154		6,479		6,622
BRAZIL | International Segment [Member]
Net sales	8,729		13,107		36,551		37,993
UNITED KINGDOM | International Segment [Member]
Net sales	5,333		6,559		15,936		18,232
CHINA | International Segment [Member]
Net sales	1,338		1,609		4,505		5,370
Australia and New Zealand [Member] | International Segment [Member]
Net sales	$ 1,229		$ 1,154		$ 4,509		$ 4,439

[1] Excludes $1,063 of North American segment intercompany sales to the International segment, and $2,722 of International segment intercompany sales to the North American segment.

[2] Excludes $1,063 of North American segment intercompany sales to the International segment, and $2,722 of International segment intercompany sales to the North American segment.

[3] Excludes $3,079 of North American segment intercompany sales to the International segment, and $10,820 of International segment intercompany sales to the North American segment.

[4] Excludes $3,736 of North American segment intercompany sales to the International segment, and $10,985 of International segment intercompany sales to the North American segment.