XML 103 R40.htm IDEA: XBRL DOCUMENT v3.24.1.u1

ORGANIZATION (Details)	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Investment portfolio, debt investments, intended percent	75.00%
Investment portfolio, equity investments, intended percent	25.00%
Investment portfolio, debt investments, actual percent	77.00%
Investment portfolio, equity investments, actual percent	23.00%

X

- Definition

Investment Portfolio, Debt Investments, Actual Percent

+ References

No definition available.

+ Details

Name:	gain_InvestmentPortfolioDebtInvestmentsActualPercent
Namespace Prefix:	gain_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Investment Portfolio, Debt Investments, Intended Percent

+ References

No definition available.

+ Details

Name:	gain_InvestmentPortfolioDebtInvestmentsIntendedPercent
Namespace Prefix:	gain_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Investment Portfolio, Equity Investments, Actual Percent

+ References

No definition available.

+ Details

Name:	gain_InvestmentPortfolioEquityInvestmentsActualPercent
Namespace Prefix:	gain_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Investment Portfolio, Equity Investments, Intended Percent

+ References

No definition available.

+ Details

Name:	gain_InvestmentPortfolioEquityInvestmentsIntendedPercent
Namespace Prefix:	gain_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration