XML 74 R56.htm IDEA: XBRL DOCUMENT
v3.24.0.1

DISTRIBUTIONS TO COMMON STOCKHOLDERS - Adjustments for Book-tax Differences to Reflect Tax Character (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023
Equity [Abstract] |  |
Undistributed net investment income | $ 0 | $ (373)
Accumulated net realized gain (loss) | 0 | 373
Capital in excess of par value | $ 0 | $ 0

X
- Definition Additional Paid in Capital Adjustments + References No definition available. + Details
Name: | glad_AdditionalPaidInCapitalAdjustments
Namespace Prefix: | glad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Investment Company, Accumulated Net Realized Gain (Loss) In Excess Of Distributions Adjustments + References No definition available. + Details
Name: | glad_InvestmentCompanyAccumulatedNetRealizedGainLossInExcessOfDistributionsAdjustments
Namespace Prefix: | glad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Investment Company, Distributable Earnings (Loss), Accumulated Ordinary Income (Loss) Adjustments + References No definition available. + Details
Name: | glad_InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLossAdjustments
Namespace Prefix: | glad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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