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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($)
Advertising Expense | $ 3,800 | $ 4,500 | $ 5,200
Available-for-Sale Securities, Debt Maturities, Date Range Low | 90 days |  |
Available-for-sale Securities, Debt Maturities, Date Range High | 6 years |  |
Impairment of Long-Lived Assets Held-for-use | $ 0 |  |
Number of Reporting Units | 1 |  |
Goodwill, Impairment Loss | $ 0 |  |
Minimum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 1 year |  |
Maximum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 20 years |  |
Equipment [Member] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Building, Building Improvements and Leasehold Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Building, Building Improvements and Leasehold Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |

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