Document and Entity Information - shares	3 Months Ended
Jun. 30, 2019	Aug. 14, 2019
Text Block [Abstract]
Registrant Name	GB SCIENCES INC
Registrant CIK	0001165320
SEC Form	10-Q
Period End date	Jun. 30, 2019
Fiscal Year End	--03-31
Tax Identification Number (TIN)	59-3733133
Number of common stock shares outstanding		252,882,769
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Shell Company	false
Current with reporting	Yes
Entity Interactive Data Current	Yes
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Entity Incorporation, State or Country Code	NV
File Number	000-55462
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

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The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

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Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

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