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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jul. 01, 2019 USD ($) | Jul. 01, 2018 USD ($)
Advertising Expense |  |  | $ 4,100 | $ 3,800 | $ 4,500 |  |
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 | 0 | $ 0 |  |
Number of Reporting Units |  |  | 1 |  |  |  |
Goodwill, Impairment Loss |  |  | $ 0 |  |  |  |
Available-for-sale Securities, Total |  |  | 38,200 | 54,300 |  |  | $ 54,300
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax, Total |  |  |  |  |  |  | 35,400
Deferred Tax Liabilities, Other Comprehensive Income |  |  | 4,542 | 8,384 |  |  | 8,300
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total |  |  | (83,521) | (44,814) |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  |  | $ 931,934 | $ 876,931 |  |  |
Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total |  |  |  |  |  |  | (27,100)
Retained Earnings (Accumulated Deficit), Ending Balance |  |  |  |  |  |  | 27,100
Accounting Standards Update 2016-01 [Member] | Other Nonoperating Income (Expense) [Member] |  |  |  |  |  |  |
Equity Securities, FV-NI, Gain (Loss), Total | $ 12,300 | $ 2,900 |  |  |  |  |
Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total |  |  |  |  |  |  | 2,400
Retained Earnings (Accumulated Deficit), Ending Balance |  |  |  |  |  |  | $ (2,400)
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  | $ 82,000 |
Operating Lease, Liability, Total |  |  |  |  |  | $ 82,000 |
Minimum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 1 year |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 20 years |  |  |  |
Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 3 years |  |  |  |
Equipment [Member] | Maximum [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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