Amount, after liabilities, of entity's interest in assets after deconsolidation of subsidiary.

No definition available.

Name:	gblx_DeconsolidationAssetsNet
Namespace Prefix:	gblx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the carrying amount of entity's interest in assets after deconsolidation of subsidiary.

+ References

No definition available.

+ Details

Name:	gblx_DeconsolidationCarryingAmountOfAssets
Namespace Prefix:	gblx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the carrying amount of entity's interest after deconsolidation of subsidiary.

+ References

No definition available.

+ Details

Name:	gblx_DeconsolidationCarryingAmountOfInterest
Namespace Prefix:	gblx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the carrying amount of entity's interest in liabilities after deconsolidation of subsidiary.

+ References

No definition available.

+ Details

Name:	gblx_DeconsolidationCarryingAmountOfLiabilities
Namespace Prefix:	gblx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the total amount of entity's interest after deconsolidation of subsidiary.

+ References

No definition available.

+ Details

Name:	gblx_DeconsolidationEntitysInterestNet
Namespace Prefix:	gblx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684

+ Details

Name:	us-gaap_DeconsolidationGainOrLossAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The receivable or note face amount less the unamortized discount or premium.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

+ Details

Name:	us-gaap_ReceivableWithImputedInterestNetAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	srt_OwnershipAxis=gblx_GBSciencesLouisianaLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 10 - Sale of 50% Membership Interest in GB Sciences Louisiana, LLC - Deconsolidation (Details) - USD ($)		3 Months Ended		9 Months Ended
	Nov. 15, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
GAIN ON DECONSOLIDATION	$ 4,502,058	$ 4,502,058		$ 4,502,058
GB Sciences Louisiana, LLC [Member]
Present value of promissory note	6,610,592
Carrying amount of non-controlling interest	8,707,651
TOTAL	15,318,243
Carrying amount of assets	14,715,798
Carrying amount of liabilities	(3,899,613)
Net assets deconsolidated	10,816,185
GAIN ON DECONSOLIDATION	$ 4,502,058