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Note 6 - Fair Value (Details Textual)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
$ / shares
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
$ / shares
Sep. 30, 2022
USD ($)
Jun. 30, 2022
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net $ (5,000) $ (1,117) $ (5,111) $ (1,117)  
Unrealized Gain (Loss) on Investments (17,518) 3,442 (24,448) 1,169  
Warrant [Member]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net 0 (1,117) 0 (1,117)  
Equity Securities [Member]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net 0 0 (111) 0  
Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 $ 5,000        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net     5,000    
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] | Debt Securities [Member]          
Unrealized Gain (Loss) on Investments     (33,600) (3,500)  
Fair Value, Inputs, Level 3 [Member] | Warrant [Member]          
Unrealized Gain (Loss) on Investments     (2,100) 1,200  
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]          
Unrealized Gain (Loss) on Investments     $ (1,600) (400)  
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  
The 2026 Notes [Member]          
Debt Instrument, Share Price (in dollars per share) | $ / shares $ 23.60   $ 23.60    
The 2026 Notes [Member] | Fair Value, Inputs, Level 1 [Member]          
Debt Instrument, Fair Value Disclosure $ 54,300   $ 54,300    
The 2027 Notes [Member]          
Debt Instrument, Share Price (in dollars per share) | $ / shares $ 24.18   $ 24.18    
The 2027 Notes [Member] | Fair Value, Inputs, Level 1 [Member]          
Debt Instrument, Fair Value Disclosure $ 55,600   $ 55,600    
Asset-backed Notes 2019 [Member] | Fair Value, Inputs, Level 3 [Member]          
Debt Instrument, Fair Value Disclosure 18,700   18,700    
Asset-backed Notes 2022 [Member] | Fair Value, Inputs, Level 3 [Member]          
Debt Instrument, Fair Value Disclosure $ 100,000   $ 100,000    
Measurement Input, Hypothetical Market Yields [Member]          
Debt Instrument, Measurement Input         0.25