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Note 6 - Fair Value (Details Textual) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) $ / shares | Mar. 31, 2023 USD ($) | Jun. 30, 2022
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | $ 0 |  |
Unrealized Gain (Loss) on Investments | (3,960) | $ (7,537) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net |  | 0 |
Fair Value, Inputs, Level 1 [Member] | Warrants and Equity Securities [Member] |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |  |
Unrealized Gain (Loss) on Investments | (1,800) | (4,600) |
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |  |
Unrealized Gain (Loss) on Investments | $ (1,200) | (200) |
Fair Value, Inputs, Level 3 [Member] | Warrant [Member] |  |  |
Unrealized Gain (Loss) on Investments |  | $ (1,400) |
The 2026 Notes [Member] |  |  |
Debt Instrument, Share Price (in dollars per share) | $ / shares | $ 23.75 |  |
The 2026 Notes [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Debt Instrument, Fair Value Disclosure | $ 54,600 |  |
The 2027 Notes [Member] |  |  |
Debt Instrument, Share Price (in dollars per share) | $ / shares | $ 23.8 |  |
The 2027 Notes [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Debt Instrument, Fair Value Disclosure | $ 54,700 |  |
Asset-backed Notes 2022 [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Debt Instrument, Fair Value Disclosure | $ 100,000 |  |
Measurement Input, Hypothetical Market Yields [Member] |  |  |
Debt Instrument, Measurement Input |  |  | 0.25

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