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Note 6 - Fair Value - Assets at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Recurring [Member] |  |
Investments, fair value | $ 634,624 | $ 458,075
Fair Value, Recurring [Member] | Money Market Funds [Member] |  |
Investments, fair value | 7,732 | 7,868
Fair Value, Recurring [Member] | Money Market Funds, Restricted Investments [Member] |  |
Investments, fair value | 1,617 | 1,359
Fair Value, Recurring [Member] | Debt [Member] |  |
Investments, fair value | 609,032 | 437,317
Fair Value, Recurring [Member] | Warrant [Member] |  |
Investments, fair value | 22,113 | 20,200
Fair Value, Recurring [Member] | Other Investments [Member] |  |
Investments, fair value | 1,300 | 200
Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Investments, fair value | 2,179 | 358
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Investments, fair value | 146 | 155
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member] |  |
Investments, fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Money Market Funds, Restricted Investments [Member] |  |
Investments, fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Debt [Member] |  |
Investments, fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Warrant [Member] |  |
Investments, fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Other Investments [Member] |  |
Investments, fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Investments, fair value | 146 | 155
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Investments, fair value | 219 | 363
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member] |  |
Investments, fair value | 7,732 | 7,868
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Money Market Funds, Restricted Investments [Member] |  |
Investments, fair value | 1,617 | 1,359
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Debt [Member] |  |
Investments, fair value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Warrant [Member] |  |
Investments, fair value | 219 | 363
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Other Investments [Member] |  |
Investments, fair value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Investments, fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Investments, fair value | 634,259 | 457,557
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Investments, fair value | 634,259 | 457,557
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member] |  |
Investments, fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Money Market Funds, Restricted Investments [Member] |  |
Investments, fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Debt [Member] |  |
Investments, fair value | 609,032 | 437,317
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Warrant [Member] |  |
Investments, fair value | 21,894 | 19,837
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Other Investments [Member] |  |
Investments, fair value | 1,300 | 200
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member] |  |
Investments, fair value | $ 2,033 | $ 203

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