XML 80 R63.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Income Taxes - Summary of Components of Distributable Earnings on Tax Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Accumulated capital gains/(losses) | $ (20,815) | $ (20,346)
Other temporary differences | 0 | (20,350)
Undistributed ordinary income | 66,765 | 62,202
Unrealized appreciation/(depreciation) | (52,656) | (45,066)
Components of distributable earnings | $ (6,706) | $ (23,560)

X
- Definition Investment company components of distributable earnings. + References No definition available. + Details
Name: | trin_InvestmentCompanyComponentsOfDistributableEarnings
Namespace Prefix: | trin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Other temporary differences. + References No definition available. + Details
Name: | trin_OtherTemporaryDifferences
Namespace Prefix: | trin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of accumulated undistributed earnings (deficit) from unrealized appreciation (depreciation) of investment company. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480990/946-20-50-12 + Details
Name: | us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedAppreciationDepreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of accumulated undistributed deficit from capital loss carryforward of investment company. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480990/946-20-50-12 + Details
Name: | us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedCapitalLossCarryforward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated undistributed earnings (deficit) from ordinary income (loss) of investment company. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480990/946-20-50-12 + Details
Name: | us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant