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Note 6 - Fair Value (Details Textual) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 USD ($) $ / shares | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) $ / shares | Sep. 30, 2021 USD ($) | Dec. 31, 2021
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net, Total | $ (1,117) | $ 0 | $ (1,117) | $ (120) |
Unrealized Gain (Loss) on Investments | 3,442 | $ 3,376 | 1,169 | 8,122 |
Warrant [Member] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net, Total | (1,117) |  | (1,117) | (71) |
Debt [Member] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net, Total | 0 |  | 0 | 0 |
Equity Securities [Member] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net, Total | 0 |  | 0 | (49) |
Fair Value, Inputs, Level 2 [Member] | Warrant [Member] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 40 |  | 40 | 100 |
Fair Value, Inputs, Level 1 [Member] | Warrant [Member] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | $ 1,100 |  | 1,100 |  |
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  |  |  | 100 |
Fair Value, Inputs, Level 3 [Member] | Warrant [Member] |  |  |  |  |
Unrealized Gain (Loss) on Investments |  |  | 1,200 | 6,300 |
Fair Value, Inputs, Level 3 [Member] | Debt [Member] |  |  |  |  |
Unrealized Gain (Loss) on Investments |  |  | 3,500 | 300 |
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |  |  |  |
Unrealized Gain (Loss) on Investments |  |  | $ 400 | $ 1,500 |
The 2026 Notes [Member] |  |  |  |  |
Debt Instrument, Share Price (in dollars per share) | $ / shares | $ 24.37 |  | $ 24.37 |  |
The 2026 Notes [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Debt Instrument, Fair Value Disclosure, Total | $ 56,100 |  | $ 56,100 |  |
The 2027 Notes [Member] |  |  |  |  |
Debt Instrument, Share Price (in dollars per share) | $ / shares | $ 23.18 |  | $ 23.18 |  |
The 2027 Notes [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Debt Instrument, Fair Value Disclosure, Total | $ 53,300 |  | $ 53,300 |  |
Asset-Backed Notes [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Debt Instrument, Fair Value Disclosure, Total | $ 43,500 |  | $ 43,500 |  |
Measurement Input, Hypothetical Market Yields [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument, Measurement Input | 0.03 |  | 0.03 |  | 0.03
Measurement Input, Hypothetical Market Yields [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument, Measurement Input | 0.25 |  | 0.25 |  | 0.23

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 + Details
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