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v3.26.1

Debt - Schedule of Senior Securities (Including Debt Securities and Other Indebtedness) (Details) - Senior Notes - USD ($) $ / shares in Units, $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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8.25% Notes due 2020 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding |  |  |  |  |  |  |  |  |  |  | $ 33,646
Asset Coverage Ratio Per Unit |  |  |  |  |  |  |  |  |  |  | $ 6,168
Average Market Value Per Unit |  |  |  |  |  |  |  |  |  |  | $ 1.02
GECCL Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding |  |  |  |  |  |  | $ 30,293 | $ 32,631 | $ 32,631 | $ 32,631 |
Asset Coverage Ratio Per Unit |  |  |  |  |  |  | $ 1,671 | $ 1,701 | $ 2,393 | $ 5,010 |
Average Market Value Per Unit |  |  |  |  |  |  | $ 0.89 | $ 1.01 | $ 1.01 | $ 1.02 |
GECCM Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding |  |  |  | $ 45,610 | $ 45,610 | $ 45,610 | $ 45,610 | $ 46,398 | $ 46,398 |  |
Asset Coverage Ratio Per Unit |  |  |  | $ 1,690 | $ 1,544 | $ 1,511 | $ 1,671 | $ 1,701 | $ 2,393 |  |
Average Market Value Per Unit |  |  |  | $ 0.99 | $ 0.99 | $ 1 | $ 0.84 | $ 1.01 | $ 0.98 |  |
GECCN Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding |  |  |  |  | $ 42,823 | $ 42,823 | $ 42,823 | $ 45,000 |  |  |
Asset Coverage Ratio Per Unit |  |  |  |  | $ 1,544 | $ 1,511 | $ 1,671 | $ 1,701 |  |  |
Average Market Value Per Unit |  |  |  |  | $ 1 | $ 1 | $ 0.84 | $ 1 |  |  |
GECCO Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding |  | $ 38,983 | $ 57,500 | $ 57,500 | $ 57,500 | $ 57,500 |  |  |  |  |
Asset Coverage Ratio Per Unit |  | $ 1,581 | $ 1,697 | $ 1,690 | $ 1,544 | $ 1,511 |  |  |  |  |
Average Market Value Per Unit |  | $ 1.01 | $ 0.99 | $ 0.96 | $ 1 | $ 1.02 |  |  |  |  |
GECCZ Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding |  |  | $ 40,000 | $ 40,000 |  |  |  |  |  |  |
Asset Coverage Ratio Per Unit |  |  | $ 1,697 | $ 1,690 |  |  |  |  |  |  |
Average Market Value Per Unit |  |  | $ 1.01 | $ 0.99 |  |  |  |  |  |  |
GECCI Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding | $ 56,500 | $ 56,500 | $ 56,500 |  |  |  |  |  |  |  |
Asset Coverage Ratio Per Unit | $ 1,664 | $ 1,581 | $ 1,697 |  |  |  |  |  |  |  |
Average Market Value Per Unit | $ 1.01 | $ 1.01 | $ 1.01 |  |  |  |  |  |  |  |
GECCH Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding | $ 41,400 | $ 41,400 | $ 41,400 |  |  |  |  |  |  |  |
Asset Coverage Ratio Per Unit | $ 1,664 | $ 1,581 | $ 1,697 |  |  |  |  |  |  |  |
Average Market Value Per Unit | $ 1.01 | $ 1 | $ 1 |  |  |  |  |  |  |  |
GECCG Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding | $ 57,500 | $ 57,500 |  |  |  |  |  |  |  |  |
Asset Coverage Ratio Per Unit | $ 1,664 | $ 1,581 |  |  |  |  |  |  |  |  |
Average Market Value Per Unit | $ 1 | $ 1 |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Amount Outstanding | $ 11,000 |  |  |  | $ 10,000 |  |  |  |  |  |
Asset Coverage Ratio Per Unit | $ 1,664 | $ 1,581 | $ 1,697 | $ 1,690 | $ 1,544 |  |  |  |  |  |

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