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Note 5 - Notes Payable and Line of Credit (Details Textual)
1 Months Ended 9 Months Ended 12 Months Ended
Mar. 04, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 14, 2021
USD ($)
Dec. 29, 2020
USD ($)
Aug. 10, 2020
USD ($)
Oct. 23, 2017
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Jul. 24, 2020
USD ($)
Gain (Loss) on Extinguishment of Debt, Total                   $ 22,405 $ 467,872  
Gain (Loss) on Amendment to Line of Credit                   0 (650,000)  
GB Sciences Nopah, LLC [Member]                        
Receivable with Imputed Interest, Effective Yield (Interest Rate)               8.00% 8.00%      
Extinguishment of Debt, Amount               $ 3,462,854 $ 3,462,854      
Financing Receivable, after Allowance for Credit Loss, Total   $ 3,025,000           3,025,000 3,025,000      
GB Sciences Nopah, LLC [Member] | Accounts Payable Due to Affiliate of the Purchaser [Member]                        
Extinguishment of Debt, Amount   74,647 $ 74,647   $ 74,647              
Teco Subsidiaries [Member] | The July 24 Note [Member]                        
Financing Receivable, after Allowance for Credit Loss, Total   1,025,000   $ 3,025,000       1,025,000 1,025,000      
Increase (Decrease) in Notes Receivable, Current       975,000                
Notes Receivable, Maximum Allowed Prepayments On Note       325,000                
Disposal Group, Including Discontinued Operation, Consideration       $ 4,000,000                
Gain (Loss) on Amendment to Line of Credit                     $ (650,000)  
Notes Receivable, Additional Advances                 50,000      
Interest and Debt Expense, Total                 12,510      
The July 24 Note [Member] | Revolving Credit Facility [Member]                        
Debt Instrument, Interest Rate, Stated Percentage                       8.00%
Line of Credit Facility, Maximum Borrowing Capacity                       $ 500,000
The July 24 Note [Member] | Teco Subsidiaries [Member]                        
Financing Receivable, after Allowance for Credit Loss, Total                       $ 4,000,000
Debt Instrument, Forgiveness, Ratio of Notes Receivable Amount Reduced to the Debt Balance Outstanding                       3
Promissory Note [Member]                        
Debt Instrument, Face Amount             $ 496,797     496,797    
Promissory Note [Member] | The 0% Note Payable Dated October 23, 2017 [Member]                        
Debt Instrument, Interest Rate, Stated Percentage         0.00% 0.00%            
Debt Instrument, Face Amount           $ 700,000            
Debt Instrument, Term (Year)           3 years            
Debt Instrument, Present Value           $ 521,067            
Receivable with Imputed Interest, Effective Yield (Interest Rate)           20.30%            
Debt Instrument, Unamortized Discount, Total           $ 178,933            
Notes Payable, Current, Total   $ 369,445           $ 369,445 $ 369,445      
Notes Payable, Principal and Interest $ 201,532                      
Notes Payable, Principal and Interest, After Modified Terms 179,127                      
Repayment of Notes Payable 75,000                 75,000    
Debt Instrument, Monthly Payment, Amount $ 5,000                      
Debt Instrument, Interest Rate, Stated Percentage, After Term Modification 8.00%                      
Gain (Loss) on Extinguishment of Debt, Total             22,405          
Notes Payable, Current and Noncurrent             104,127     104,127    
Interest Payable             $ 616     $ 616    
Promissory Note [Member] | The 0% Note Payable Dated October 23, 2017 [Member] | Membership Interest Purchase Agreement for Sale of Interest in GB Sciences Nopah, LLC [Member]                        
Debt Instrument, Principal Balance After Reduction Upon Close of Disposition         $ 190,272              
Nevada Medical Marijuana Production License Agreement [Member]                        
Payments to Acquire License           $ 500,000            
Nevada Medical Marijuana Production License Agreement [Member] | Production License [Member]                        
Ownership of License           100.00%            
Nevada Medical Marijuana Production License Agreement [Member] | Cultivation License [Member]                        
Ownership of License           100.00%