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Subsequent Events (Details) - $ / shares | Apr. 25, 2024 | Feb. 08, 2024 | May 21, 2024 | Mar. 06, 2024
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Supplemental Dividend |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Cash distribution, per share (in dollars per share) |  |  |  | $ 0.08
Base and Supplemental Dividend |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Supplemental dividends amount to be paid (in dollars per share) |  | $ 0.32 |  |
Subsequent Event | Base Dividend |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Cash distribution, per share (in dollars per share) |  |  | $ 0.40 |
Subsequent Event | Supplemental Dividend |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Cash distribution, per share (in dollars per share) | $ 0.16 |  | $ 0.08 |
Supplemental dividends amount to be paid (in dollars per share) | 0.32 |  |  |
Supplemental dividends amount to be paid each quarter (in dollars per share) | $ 0.08 |  |  |

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- Definition Supplemental Dividends Amount To Be Paid Each Quarter Per Share + References No definition available. + Details
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Namespace Prefix: | htgc_
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Balance Type: | na
Period Type: | duration

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- Definition Total Supplemental Dividends Amount To Be Paid Per Share + References No definition available. + Details
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Data Type: | dtr-types:perShareItemType
Balance Type: | na
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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-3 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 855 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483399/855-10-50-2 + Details
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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- Details
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- Details
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Namespace Prefix: |
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