Note 11 - Segment Information (Details Textual)	3 Months Ended				9 Months Ended
	Mar. 31, 2017 USD ($)		Mar. 31, 2016 USD ($)		Mar. 31, 2017 USD ($)		Mar. 31, 2016 USD ($)
Number of Reportable Segments					2
Revenue, Net	$ 50,670,000	[1]	$ 50,329,000	[2]	$ 152,770,000	[3]	$ 155,038,000	[4]
North American Segment [Member]
Revenue, Net	31,791,000	[1]	32,473,000	[2]	92,345,000	[3]	99,188,000	[4]
North American Segment [Member] | Intersegment Eliminations [Member]
Revenue, Net	1,493		2,238		6,189		6,480
International Segment [Member]
Revenue, Net	18,879,000	[1]	17,856,000	[2]	60,425,000	[3]	55,850,000	[4]
International Segment [Member] | Intersegment Eliminations [Member]
Revenue, Net	$ 2,536		$ 2,120		$ 8,585		$ 6,799

[1] Excludes $1,493 of North American segment sales to the International segment and $2,536 of International segment sales to the North American segment.

[2] Excludes $2,238 of North American segment sales to the International segment and $2,120 of International segment sales to the North American segment.

[3] Excludes $6,189 of North American segment sales to the International segment and $8,585 of International segment sales to the North American segment.

[4] Excludes $6,480 of North American segment sales to the International segment and $6,799 of International segment sales to the North American segment.