Document And Entity Information - USD ($)	12 Months Ended
	Mar. 31, 2022	Jun. 30, 2022	Sep. 30, 2021
Document Information [Line Items]
Entity Central Index Key	0001165320
Entity Registrant Name	GB SCIENCES INC
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2022
Document Type	10-K
Document Annual Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	000-55462
Entity Incorporation, State or Country Code	NV
Entity Tax Identification Number	59-3733133
Entity Address, Address Line One	3550 W. Teco Avenue
Entity Address, City or Town	Las Vegas
Entity Address, State or Province	NV
Entity Address, Postal Zip Code	89118
City Area Code	866
Local Phone Number	721-0297
Title of 12(g) Security	Common Stock $.0001 Par Value
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 11,300,000
Entity Common Stock, Shares Outstanding		329,204,224
Auditor Name	Assurance Dimensions, Inc.
Auditor Location	Margate, FL
Auditor Firm ID	5036