Note 11 - Income Taxes (Details Textual) - 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	Jun. 30, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent											21.00%	35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability											$ 6,300
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Credit										$ (1,800)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment										$ 0
Additional Tax Rate On Foreign Income (Rate)										10.50%
Effective Income Tax Rate Reconciliation, Percent, Total									(9.20%)	36.70%	174.70%
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	$ (23,435)	$ 287	$ 1,875	$ 1,276	$ 2,632	$ 3,045	$ 2,991	$ 942	$ (19,997)	$ 9,610	$ 4,865
Effective Income Tax Rate Reconciliation, Before Tax Cuts and Jobs Act, Percent											44.70%
Deferred Tax Assets, Net of Valuation Allowance, Total	21,000								21,000
Deferred Tax Assets, Valuation Allowance, Total	8,811				6,743				8,811	6,743
Unrecognized Tax Benefits, Ending Balance	11,106				10,939				11,106	10,939	$ 10,882	$ 11,588
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	7,700				5,600				7,700	5,600	$ 5,400
Income Taxes Receivable, Noncurrent	0				$ 1,666				0	1,666
Decrease in Unrecognized Tax Benefits is Reasonably Possible	100								100
Unrecognized Tax Benefits, Interest on Income Taxes Expense									100
Undistributed Earnings of Foreign Subsidiaries	56,400								56,400
Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	800								800
Foreign Tax Authority [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount									2,100	$ 1,700
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	2,300								2,300
Tax Credit Carryforward, Amount	7,200								$ 7,200
Foreign Tax Authority [Member] | Secretariat of the Federal Revenue Bureau of Brazil [Member]
Effective Income Tax Rate Reconciliation, Percent, Total									34.00%
Domestic Tax Authority [Member]
Deferred Tax Assets, Net of Valuation Allowance, Total	26,900								$ 26,900
Deferred Tax Assets, Valuation Allowance, Total	8,800								8,800
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	3,400								3,400
State and Local Jurisdiction [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	1,700								1,700
Tax Credit Carryforward, Amount	$ 600								$ 600