v3.24.2.u1

Note 12 - Retirement Plan (Details Textual) - The 401(k) Plan [Member] - USD ($)	12 Months Ended		24 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2024
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	6.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Tranche One	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay, Tranche One	3.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Tranche Two	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay, Tranche Two	2.00%
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage	100.00%
Defined Contribution Plan, Cost	$ 292,361	$ 297,159
Defined Contribution Plan, Vesting Period			5 years

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	glgi_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPayTrancheOne
Namespace Prefix:	glgi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	glgi_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPayTrancheTwo
Namespace Prefix:	glgi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage employer matches of the employee's percentage contribution matched, tranche one.

+ References

No definition available.

+ Details

Name:	glgi_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchTrancheOne
Namespace Prefix:	glgi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage employer matches of the employee's percentage contribution matched, tranche two.

+ References

No definition available.

+ Details

Name:	glgi_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchTrancheTwo
Namespace Prefix:	glgi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of vesting under defined contribution plan.

+ References

No definition available.

+ Details

Name:	glgi_DefinedContributionPlanVestingPeriod
Namespace Prefix:	glgi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RetirementPlanNameAxis=glgi_The401kPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

GREYSTONE LOGISTICS, INC. 10-K