Note 17 - Financial Information by Segment and Geographic Area - Geographic Sales and Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019		Jun. 30, 2018		Jun. 30, 2017
Revenues, Total	$ 61,091	$ 58,498	$ 56,532	$ 51,901	$ 57,552	$ 54,834	$ 52,124	$ 51,818	$ 228,022	[1]	$ 216,328	[2]	$ 207,023	[3]
Long-lived assets	49,806				50,499				49,806		50,499		53,883
UNITED STATES
Revenues, Total									127,359		119,226		115,562
Long-lived assets	35,594				37,437				35,594		37,437		39,131
North America Other than US [Member]
Revenues, Total									9,028		9,216		9,044
Long-lived assets	44				52				44		52		68
North America [Member]
Revenues, Total									136,387		128,442		124,606
Long-lived assets	35,638				37,489				35,638		37,489		39,199
BRAZIL
Revenues, Total									54,324		49,726		45,614
Long-lived assets	10,067				8,662				10,067		8,662		10,111
UNITED KINGDOM
Revenues, Total									24,042		25,099		24,954
Long-lived assets	2,046				1,876				2,046		1,876		1,976
CHINA
Revenues, Total									7,370		7,323		6,873
Long-lived assets	1,944				2,346				1,944		2,346		2,426
Australia and New Zealand [Member]
Revenues, Total									5,899		5,738		4,976
Long-lived assets	111				126				111		126		171
International [Member]
Revenues, Total									91,635		87,886		82,417
Long-lived assets	$ 14,168				$ 13,010				$ 14,168		$ 13,010		$ 14,684

[1] 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.

[2] 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.

[3] Excludes $7,902 of North American segment intercompany sales to the International segment and $11,677 intercompany sales of the International segment to the North American segment.