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, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2018
Revenues, Total	$ 42,475	$ 49,998	$ 56,864	$ 52,114	$ 61,091	$ 58,498	$ 56,532	$ 51,901	$ 201,451	[1]	$ 228,022	[2]	$ 216,328	[3]
Long-lived assets	47,567				49,806				47,567		49,806		50,499
UNITED STATES
Revenues, Total									113,989		127,359		119,226
Long-lived assets	34,264				35,594				34,264		35,594		37,437
North America Other than US [Member]
Revenues, Total									7,845		9,028		9,216
Long-lived assets	90				44				90		44		52
North America [Member]
Revenues, Total									121,834		136,387		128,442
Long-lived assets	34,354				35,638				34,354		35,638		37,489
BRAZIL
Revenues, Total									49,254		54,324		49,726
Long-lived assets	8,050				10,067				8,050		10,067		8,662
UNITED KINGDOM
Revenues, Total									18,869		24,042		25,099
Long-lived assets	1,948				2,046				1,948		2,046		1,876
CHINA
Revenues, Total									6,048		7,370		7,323
Long-lived assets	2,881				1,944				2,881		1,944		2,346
Australia and New Zealand [Member]
Revenues, Total									5,446		5,899		5,738
Long-lived assets	334				111				334		111		126
International [Member]
Revenues, Total									79,617		91,635		87,886
Long-lived assets	$ 13,213				$ 14,168				$ 13,213		$ 14,168		$ 13,010

[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.