Note 17 - Financial Information by Segment and Geographic Area (Details Textual)	3 Months Ended								12 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2020 USD ($)		Jun. 30, 2019 USD ($)		Jun. 30, 2018 USD ($)
Number of Reportable Segments									2
Revenues, Total	$ 42,475,000	$ 49,998,000	$ 56,864,000	$ 52,114,000	$ 61,091,000	$ 58,498,000	$ 56,532,000	$ 51,901,000	$ 201,451,000	[1]	$ 228,022,000	[2]	$ 216,328,000	[3]
North American Segment [Member]
Revenues, Total									121,834,000	[1]	136,387,000	[2]	128,442,000	[3]
North American Segment [Member] | Intersegment Eliminations [Member]
Revenues, Total									(4,040)		(4,879,000)		(6,468,000)
International Segment [Member]
Revenues, Total									79,617,000	[1]	91,635,000	[2]	87,886,000	[3]
International Segment [Member] | Intersegment Eliminations [Member]
Revenues, Total									$ (13,820)		$ (16,187,000)		$ (14,239,000)

[1] Excludes $4,040 of North American segment intercompany sales to the International segment and $13,820 intercompany sales of the International segment to the North American segment.

[2] Excludes $4,879 of North American segment intercompany sales to the International segment and $16,187 intercompany sales of the International segment to the North American segment.

[3] Excludes $6,468 of North American segment intercompany sales to the International segment and $14,239 intercompany sales of the International segment to the North American segment.