XML 69 R61.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Financial Highlights - Summary of Information about Senior Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jul. 27, 2022 | Oct. 27, 2021 | Dec. 11, 2020
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |  |  |  |
Convertible Notes | $ 48,916 |  | $ 48,757 |  |  |  |  |  |
Total | 737,500 | $ 616,000 |  |  |  |  |  |  |
2025 Notes |  |  |  |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  | $ 182,500 |  |
KeyBank Credit Facility |  |  |  |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |  |  |  |
Credit facility | 190,000 |  | 213,000 |  |  |  |  | $ 350,000 |
Senior Securities |  |  |  |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |  |  |  |
Credit facility | 737,500 |  | 645,500 | $ 620,000 | $ 466,000 |  |  |  |
Asset Coverage per Unit | 1,849 |  | 1,947 | 1,741 | 1,958 |  |  |  |
Senior Securities | 2025 Notes |  |  |  |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |  |  |  |
Credit facility |  | 182,500 | 182,500 | 182,500 | 125,000 | $ 125,000 |  |  |
Asset Coverage per Unit | 1,849 |  | 1,947 | 1,741 | 1,958 | 1,770 |  |  |
Average Market Value per Unit | 1,011 |  | 1,006 | 1,006 |  |  |  |  |
Senior Securities | Convertible Notes |  |  |  |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |  |  |  |
Credit facility | 50,000 |  | 50,000 | 50,000 | 50,000 |  |  |  | $ 50,000
Asset Coverage per Unit | 1,849 | $ 1,947 |  | 1,741 | 1,958 | 1,770 |  |  |
Senior Securities | August 2026 Notes |  |  |  |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |  |  |  |
Credit facility | 125,000 |  | 125,000 | 125,000 | 125,000 |  |  |  |
Asset Coverage per Unit | 1,849 |  | 1,947 |  | 1,741 | 1,958 |  |  |
Senior Securities | December 2026 Notes |  |  |  |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |  |  |  |
Credit facility | 75,000 |  | 75,000 | 75,000 |  | 75,000 |  |  |
Asset Coverage per Unit | 1,849 |  | 1,947 | 1,741 | 1,958 |  |  |  |
Senior Securities | March 2029 Notes |  |  |  |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |  |  |  |
Credit facility | 115,000 |  |  |  |  |  |  |  |
Asset Coverage per Unit | 1,849 |  |  |  |  |  |  |  |
Senior Securities | Credit Suisse Credit Facility |  |  |  |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |  |  |  |
Credit facility |  |  |  |  | 10,000 | 135,000 |  |  |
Asset Coverage per Unit |  |  |  |  | 1,958 | $ 1,770 |  |  |
Senior Securities | KeyBank Credit Facility |  |  |  |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |  |  |  |
Credit facility | 190,000 |  | 213,000 | 187,500 | 81,000 |  |  |  |
Asset Coverage per Unit | $ 1,849 |  | $ 1,947 | $ 1,741 | $ 1,958 |  |  |  |

X
- Definition Asset coverage per unit measure. + References No definition available. + Details
Name: | trin_AssetCoveragePerUnitMeasure
Namespace Prefix: | trin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Average Market Value Per Units. + References No definition available. + Details
Name: | trin_AverageMarketValuePerUnits
Namespace Prefix: | trin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_ConvertibleDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69C Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1D Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-4 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=trin_TwoThousandTwentyFiveNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=trin_KeyBankCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=trin_SeniorSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_ConvertibleNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=trin_August2026NotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=trin_December2026NotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=trin_March2029NotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=trin_CreditSuisseCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |