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Note 4 - Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jun. 30, 2017
--- | --- | ---
Total Assets |  | $ 59,764 | $ 66,102
Business Combination, Contingent Consideration, Liability, Total |  |  | 68,400
Fair Value, Inputs, Level 1 [Member] |  |  |
Total Assets |  | 59,764 | 64,045
Business Combination, Contingent Consideration, Liability, Total |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Total Assets |  |  | 2,057
Business Combination, Contingent Consideration, Liability, Total |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |
Total Assets |  |  |
Business Combination, Contingent Consideration, Liability, Total |  |  | 68,400
Equity Securities [Member] |  |  |
Investments, Fair Value Disclosure | [1] | 54,286 | 59,616
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Investments, Fair Value Disclosure | [1] | 54,286 | 59,616
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Investments, Fair Value Disclosure | [1] |  |
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Investments, Fair Value Disclosure | [1] |  |
Certificates of Deposit [Member] |  |  |
Investments, Fair Value Disclosure | [1] | 5,478 | 4,429
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Investments, Fair Value Disclosure | [1] | 5,478 | 4,429
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Investments, Fair Value Disclosure | [1] |  |
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Investments, Fair Value Disclosure | [1] |  |
Corporate Debt Securities [Member] |  |  |
Investments, Fair Value Disclosure | [1] |  | 2,057
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Investments, Fair Value Disclosure | [1] |  |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Investments, Fair Value Disclosure | [1] |  | 2,057
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Investments, Fair Value Disclosure | [1] |  |
[1] | Included in available-for-sale investments on the balance sheet

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