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Note 7 - Borrowings - Senior Securities (Details) - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance outstanding | [1] | $ 466,000 | $ 439,323 | $ 260,250 | $ 187,625 | $ 154,375 | $ 127,875 | $ 95,375 | $ 96,000 | $ 115,546 | $ 81,753
Asset Coverage Per Unit (in dollars per share) | [2] | $ 1,695 | $ 1,725 | $ 1,943 | $ 2,133 | $ 2,192 | $ 2,050 | $ 2,416 | $ 2,450 | $ 2,383 | $ 2,691
Involuntary Liquidation Preference (in dollars per share) | [3] | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
The 2019 Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Balance outstanding | [1] | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 33,000 | $ 33,000 | $ 33,000
Asset Coverage Per Unit (in dollars per share) | [2] | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 7,127 | $ 8,342 | $ 6,667
Involuntary Liquidation Preference (in dollars per share) | [3] | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Average market value per unit (in dollars per share) | [4] | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 25.42 | $ 25.26 | $ 25.64
Credit Facilities [Member] |  |  |  |  |  |  |  |  |  |  |
Balance outstanding | [5] | $ 251,000 | $ 181,750 | $ 132,250 | $ 50,250 | $ 17,000 | $ 90,500 | $ 58,000 | $ 63,000 | $ 68,000 | $ 10,000
Asset Coverage Per Unit (in dollars per share) | [2] | $ 3,147 | $ 4,169 | $ 3,823 | $ 7,965 | $ 19,908 | $ 2,896 | $ 3,973 | $ 3,733 | $ 4,048 | $ 22,000
Involuntary Liquidation Preference (in dollars per share) | [3] | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
The 2022-1 Securitization [Member] |  |  |  |  |  |  |  |  |  |  |
Balance outstanding | [1] | $ 100,000 | $ 100,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Asset Coverage Per Unit (in dollars per share) | [2] | $ 7,900 | $ 7,578 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Involuntary Liquidation Preference (in dollars per share) | [3] | $ 0 | $ 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Average market value per unit (in dollars per share) | [4] |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
The 2027 Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Balance outstanding | [5] | $ 57,500 | $ 57,500 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Asset Coverage Per Unit (in dollars per share) | [2] | $ 13,739 | $ 13,179 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Involuntary Liquidation Preference (in dollars per share) | [3] | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Average market value per unit (in dollars per share) | [4] | $ 24.26 | $ 24.09 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
The 2019-1 Securitization [Member] |  |  |  |  |  |  |  |  |  |  |
Balance outstanding | [1] | $ 0 | $ 42,573 | $ 70,500 | $ 100,000 | $ 100,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Asset Coverage Per Unit (in dollars per share) | [2] | $ 0 | $ 17,799 | $ 7,171 | $ 4,002 | $ 3,384 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Involuntary Liquidation Preference (in dollars per share) | [3] | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | 0 | 0 | 0 | 0 | 0
Average market value per unit (in dollars per share) | [4] |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
The 2026 Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Balance outstanding | [5] | $ 57,500 | $ 57,500 | $ 57,500 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Asset Coverage Per Unit (in dollars per share) | [2] | $ 13,739 | $ 13,179 | $ 8,793 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Involuntary Liquidation Preference (in dollars per share) | [3] | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Average market value per unit (in dollars per share) | [4] | $ 23.75 | $ 24.45 | $ 25.9 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
The 2013-1 Securitization [Member] |  |  |  |  |  |  |  |  |  |  |
Balance outstanding | [1] | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 14,546 | $ 38,753
Asset Coverage Per Unit (in dollars per share) | [2] | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 18,926 | $ 5,677
Involuntary Liquidation Preference (in dollars per share) | [3] | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | $ 0 | $ 0
Average market value per unit (in dollars per share) | [4] | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |  |
The 2022 Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Balance outstanding | [5] | $ 0 | $ 0 | $ 0 | $ 37,375 | $ 37,375 | $ 37,375 | $ 37,375 | $ 0 | $ 0 | $ 0
Asset Coverage Per Unit (in dollars per share) | [2] | $ 0 | $ 0 | $ 0 | $ 10,708 | $ 9,055 | $ 7,014 | $ 6,166 | $ 0 | $ 0 | $ 0
Involuntary Liquidation Preference (in dollars per share) | [3] | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Average market value per unit (in dollars per share) | [4] | $ 0 | $ 0 | $ 0 | $ 24.6 | $ 25.53 | $ 25.52 | $ 25.66 | $ 0 | $ 0 | $ 0
[1] | Total amount of senior securities outstanding at the end of the period presented.
[2] | Asset coverage per unit is the ratio of the original cost less accumulated depreciation, amortization or impairment of the Company’s total consolidated assets, less all liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness. Asset coverage per unit is expressed in terms of dollar amounts per $1,000 of indebtedness.
[3] | The amount which the holder of such class of senior security would be entitled upon the voluntary liquidation of the applicable issuer in preference to any security junior to it. The “—” in this column indicates that the SEC expressly does not require this information to be disclosed for certain types of securities.
[4] | Not applicable to the Company’s credit facilities, 2013-1 Securitization, 2019-1 Securitization and 2022-1 Securitization because such securities are not registered for public trading.
[5] | Total amount of senior securities outstanding at the end of the period presented.

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