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, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2016
Revenues, Total	$ 57,552	$ 54,834	$ 52,124	$ 51,818	$ 54,253	$ 50,670	$ 53,187	$ 48,913	$ 216,328	[1]	$ 207,023	[2]	$ 209,685	[3]
Long-lived assets	50,499				53,883				50,499		53,883		50,534
UNITED STATES
Revenues, Total									119,226		115,562		119,638
Long-lived assets	37,437				39,131				37,437		39,131		36,189
North America Other than US [Member]
Revenues, Total									9,216		9,044		10,470
Long-lived assets	52				68				52		68		350
North America [Member]
Revenues, Total									128,442		124,606		130,108
Long-lived assets	37,489				39,199				37,489		39,199		36,539
BRAZIL
Revenues, Total									49,726		45,614		43,283
Long-lived assets	8,662				10,111				8,662		10,111		8,818
UNITED KINGDOM
Revenues, Total									25,099		24,954		24,485
Long-lived assets	1,876				1,976				1,876		1,976		2,143
CHINA
Revenues, Total									7,323		6,873		7,207
Long-lived assets	2,346				2,426				2,346		2,426		2,887
Australia and New Zealand [Member]
Revenues, Total									5,738		4,976		4,602
Long-lived assets	126				171				126		171		147
International [Member]
Revenues, Total									87,886		82,417		79,577
Long-lived assets	$ 13,010				$ 14,684				$ 13,010		$ 14,684		$ 13,995

[1] 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.

[2] 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.

[3] Excludes $8,259 of North American segment intercompany sales to the International segment and $9,282 intercompany sales of the International segment to the North American segment.