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Note 4 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 01, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Payments to Acquire Investments, Total |  | $ (0) | $ (0) | $ 63,800 | $ (0) |
Investment in Limited Partnership Member] |  |  |  |  |  |
Provision for Credit Loss on Investments |  | 0 |  | 0 |  |
Equity Method Investments |  | 14,900 |  | 14,900 |  | $ 13,100
Cost Based Investments [Member] |  |  |  |  |  |
Investments, Total |  | 14,000 |  | 14,000 |  | 14,000
Vexcel Group, Inc. [Member] |  |  |  |  |  |
Payments to Acquire Investments, Total | $ 63,800 |  |  |  |  |
Equity Securities Without Readily Determinable Fair Value, Percentage | 35.00% |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  | 129,700 |  | 129,700 |  |
Provision for Credit Loss on Investments |  | 0 |  | 0 |  |
Registered Investment Companies [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |
Investments, Fair Value Disclosure, Total |  | $ 3,700 |  | $ 3,700 |  | $ 3,600

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