Note 2 - Segment Information - Summary of Financial Results for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Mar. 31, 2019		Mar. 31, 2018		Mar. 31, 2019		Mar. 31, 2018
Sales	$ 58,498	[1]	$ 54,834	[2]	$ 166,931	[3]	$ 158,776	[4]
Operating Income (Loss)	3,300		2,213		7,348		3,106
North American Segment [Member]
Sales	36,069	[1]	34,119	[2]	100,897	[3]	94,937	[4]
Operating Income (Loss)	3,081		2,831		6,248		5,545
International [Member]
Sales	22,429	[1]	20,715	[2]	66,034	[3]	63,839	[4]
Operating Income (Loss)	2,015		629		5,826		1,629
Unallocated [Member]
Sales		[1]		[2]		[3]		[4]
Operating Income (Loss)	$ (1,796)		$ (1,247)		$ (4,726)		$ (4,068)

[1] Excludes $1,555 of North American segment intercompany sales to the International segment, and $3,922 of International segment intercompany sales to the North American segment.

[2] Excludes $1,527 of North American segment intercompany sales to the International segment, and $3,602 of International segment intercompany sales to the North American segment.

[3] 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.

[4] Excludes $4,804 of North American segment intercompany sales to the International segment, and $10,290 of International segment intercompany sales to the North American segment.