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Note 13 - Sale of 50% Membership Interest in GB Sciences Louisiana, LLC (Details Textual) - USD ($)
1 Months Ended 2 Months Ended 4 Months Ended 12 Months Ended
Dec. 16, 2020
Dec. 08, 2020
Oct. 29, 2020
Nov. 15, 2019
Sep. 30, 2020
Aug. 31, 2020
Oct. 15, 2020
Oct. 15, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Aug. 24, 2020
Aug. 23, 2020
Receivable with Imputed Interest, Discount       $ 1,389,408                  
Deconsolidation, Gain (Loss), Amount       4,393,242         $ 4,393,242      
Repayments of Related Party Debt                 $ 151,923      
Wellcana Note [Member]                          
Note Receivable, Interest Rate                 5.00%        
Receivable with Imputed Interest, Discount                 $ 1,389,408        
Receivable with Imputed Interest, Effective Yield (Interest Rate)                 17.00%        
Receivable with Imputed Interest, Net Amount, Total       6,610,592         $ 6,610,592        
Proceeds from Collection of Notes Receivable $ 4,900,000             $ 4,900,000          
Financing Receivable, after Allowance for Credit Loss, Total                   $ 7,119,857      
GB Sciences Louisiana, LLC [Member]                          
Deconsolidation, Gain (Loss), Amount       4,393,242                  
Wellcana Group, LLC [Member] | GB Sciences Louisiana, LLC [Member]                          
Proceeds from Divestiture of Businesses       8,000,000                  
Earnout Payments       $ 8,000,000                  
Proceeds from Collection of Notes Receivable and Liabilities Forgiveness             $ 5,224,423            
Repayments of Related Party Debt           $ 151,923 151,923            
Debt Instrument, Decrease, Forgiveness         $ 172,500   172,500            
Proceeds from Collection of Notes Receivable $ 4,150,000       $ 550,000 $ 550,000 4,900,000            
Note Receivable Satisfied             8,000,000            
Annual Research Contribution Commitment to LSU Assumed by Counter Party             250,000            
Notes Receivable, Net, Scheduled Payments                       $ 500,000 $ 750,000
Financing Receivable, after Allowance for Credit Loss, Total                     $ 4,350,000    
Notes Receivable, Not Yet Collectible             $ 4,350,000 $ 4,350,000          
Notes Receivable, Due Date Extended   $ 4,350,000                      
Notes Receivable, Amount for Which Proof of Funds is Required   4,350,000                      
Notes Receivable, Escrow Deposit Required of Other Party   250,000                      
Notes Receivable, Escrow Payment Received     $ 250,000                    
Notes Receivable, Escrow Payment Not Yet Received   250,000                      
Notes Receivable, Retained Amount Not Offset Against Full Balance   $ 50,000                      
Wellcana Group, LLC [Member] | GB Sciences Louisiana, LLC, Sale of Equity [Member]                          
Sale of Stock, Percentage of Ownership       50.01%