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Note 10 - Income Taxes (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Effective Income Tax Rate Before Discretion, at Federal Statutory Income Tax Rate, Percent		28.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 56,000	$ 1,340,000
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	1,490,000
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	(540,000)	$ (11,700,000)
Tax Period, Repatriation of Foreign Earnings		8 years
Effective Income Tax Rate Reconciliation, Anticipated Cash Repatriation, Amount		$ 7,800,000
Effective Income Tax Rate Reconciliation, Section 965 Toll Tax, Amount		11,700,000
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount			$ 600,000	$ 700,000
Effective Income Tax Rate Reconciliation, Income Tax Rate Differential, Other Jurisdictions, Amount			(5,300,000)	(4,900,000)
Effective Income Tax Rate Reconciliation, Disposition of Asset, Amount				(900,000)
Income Tax Expense (Benefit), Total		40,620,000	15,355,000	$ 16,295,000
Deferred Tax Liabilities, Previously Undistributed Foreign Earnings	4,200,000	4,200,000
Deferred Tax Liabilities, Current Undistributed Foreign Earnings	3,100,000	3,100,000
Estimated Income Tax Liability for Undistributed Foreign Earnings	1,800,000	1,800,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	2,500,000	2,500,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	100,000	100,000	100,000
Accounting Standards Update 2016-09 [Member]
Income Tax Expense (Benefit), Total		(395)	$ (600,000)
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	61,600,000	61,600,000
Tax Credit Carryforward, Amount	2,500,000	2,500,000
Foreign Tax Authority [Member]
Operating Loss Carryforwards, Total	3,100,000	3,100,000
Foreign Tax Authority [Member] | Indefinite Lived [Member]
Operating Loss Carryforwards, Total	2,400,000	2,400,000
Foreign Tax Authority [Member] | Ten Years [Member]
Operating Loss Carryforwards, Total	$ 700,000	$ 700,000

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