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Note 10 - Income Taxes (Details Textual) € in Millions | 12 Months Ended
--- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 EUR (€) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($)
R&D Europe [Member] |  |  |  |
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries | € |  | € 46.6 |  |
Income Tax Expense (Benefit) |  |  | $ 1,700,000 |
Capital Loss Carryforward [Member] |  |  |  |
Deferred Tax Assets, Valuation Allowance | $ 5,000,000 |  | 0 |
Operating Loss and Credit Carryforwards [Member] |  |  |  |
Deferred Tax Assets, Valuation Allowance | 2,000,000 |  | 2,400,000 |
Deferred Tax Assets, Investment [Member] |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 5,000,000 |  |  |
Deferred Tax Asset, Operating Loss Carry Forwards [Member] |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (300,000) |  |  |
Operating Loss Carryforwards [Member] |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance | 24,900,000 |  |  |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |
Operating Loss Carryforwards | 63,900,000 |  |  |
Tax Credit Carryforward, Amount | 1,700,000 |  |  |
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards | 71,600,000 |  |  |
Tax Credit Carryforward, Amount | 1,300,000 |  |  |
Foreign Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards | $ 2,100,000 |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% |  |  |
Change in Effective Income Tax Rate, Percentage | (0.90%) |  |  |
Income Tax Expense (Benefit) | $ 43,005,000 |  | 46,427,000 | $ 50,444,000
Deferred Tax Assets, Valuation Allowance | 7,201,000 |  | 2,558,000 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 4,700,000 |  |  |
Deferred Tax Assets, Net of Valuation Allowance | 50,526,000 |  | 57,789,000 |
Deferred Tax Assets, Tax Credit Carryforwards | 3,197,000 |  | $ 3,872,000 |
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries | $ 57,600,000 |  |  |

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