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Note 5 - Notes Payable (Details Textual)
2 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 11 Months Ended 12 Months Ended
Nov. 15, 2019
USD ($)
Mar. 04, 2019
USD ($)
Feb. 06, 2019
USD ($)
Jan. 16, 2019
USD ($)
Dec. 21, 2018
USD ($)
shares
Dec. 20, 2018
USD ($)
Jul. 31, 2018
USD ($)
shares
Jul. 28, 2018
USD ($)
Oct. 23, 2017
USD ($)
Feb. 18, 2020
USD ($)
Feb. 14, 2020
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
shares
Feb. 18, 2020
USD ($)
Nov. 15, 2019
USD ($)
Mar. 31, 2019
USD ($)
Nov. 27, 2019
USD ($)
Nov. 30, 2018
Stock Issued to Settle Royalty Agreement, Value                       $ 95,000     $ 131,000          
Interest Paid, Excluding Capitalized Interest, Operating Activities                             451,040 539,242          
Other Expenses, Total                               3,140,925          
Proceeds from Lines of Credit, Total                             330,000            
Long-term Line of Credit, Total                             330,000            
Subsequent Event [Member]                                          
Proceeds from Lines of Credit, Total                     $ 150,000           $ 480,000        
Line of Credit Facility, Maximum Borrowing Capacity, Increased                   $ 10,000                      
GB Sciences, Nevada, LLC and GB Sciences Las Vegas, LLC [Member]                                          
Noncontrolling Interest, Ownership Percentage to be Sold by Parent 75.00%                                 75.00%   75.00%  
Line of Credit [Member]                                          
Line of Credit Facility, Maximum Borrowing Capacity                                       $ 470,000  
Promissory Note [Member]                                          
Debt Instrument, Face Amount                             6,020,230            
Other Expense [Member]                                          
Repayments of Debt                               $ 1,000,000          
Stock Issued to Settle Royalty Agreement, Shares | shares                               600,000          
Stock Issued During Period, Expense, New Issues                               $ 131,000          
Royalty Expense                       1,530,000       $ 1,530,000          
The 0% Note Payable Dated October 23, 2017 [Member] | Promissory Note [Member]                                          
Debt Instrument, Face Amount                             369,444            
Debt Instrument, Debt Default, Remaining Balance                             369,444            
The 0% Note Payable Dated October 23, 2017 [Member] | Promissory Note [Member]                                          
Debt Instrument, Face Amount                 $ 700,000                        
Debt Instrument, Interest Rate, Stated Percentage                 0.00%                        
Interest Expense, Debt, Total                             31,092            
Debt Instrument, Term                 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            
Debt Instrument, Accrued Monthly Payments, Amount                             $ 155,555            
Days to Cure Breach of Default After Notification From Lender                             10            
Debt Instrument, Debt Default, Interest Rate Penalty                             10.00%            
Amendment and Termination Agreement [Member] | Pacific Leaf [Member]                                          
Stock Issued to Settle Royalty Agreement, Shares | shares             100,000                            
Stock Issued to Settle Royalty Agreement, Value             $ 36,000                            
Amendment and Termination Agreement [Member] | Pacific Leaf [Member] | Other Expense [Member]                                          
Stock Issued to Settle Royalty Agreement, Value                         $ 36,000                
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 Licence                 100.00%                        
Nevada Medical Marijuana Production License Agreement [Member] | Cultivation License [Member]                                          
Ownership of Licence                 100.00%                        
Pacific Leaf [Member] | The 6% Note Payable Due November 30, 2018 [Member]                                          
Debt Conversion, Original Debt, Amount               $ 500,000                          
Debt Instrument, Interest Rate, Stated Percentage                                         6.00%
Interest Expense, Debt, Total                       $ 5,425                  
Stock Issued to Settle Royalty Agreement, Shares | shares         500,000                                
Repayments of Notes Payable   $ 210,000 $ 100,000 $ 100,000 $ 100,000                                
Interest Paid, Excluding Capitalized Interest, Operating Activities         12,164                                
Repayments of Notes Payable, Principal         $ 87,836                                
Stock Issued During Period, Expense, New Issues                                     $ 95,000    
Pacific Leaf [Member] | Amendment and Termination Agreement [Member]                                          
Repayments of Debt               1,000,000                          
Debt Instrument, Face Amount               $ 1,500,000                          
Pacific Leaf [Member] | Amendment and Termination Agreement [Member] | Other Expense [Member]                                          
Repayments of Debt                         $ 1,000,000 $ 1,000,000              
BCM MED [Member] | The 0% Note Payable Dated December 20, 2018 [Member] | Notes Payable, Other Payables [Member]                                          
Repayments of Debt                                   $ 266,667      
Debt Instrument, Face Amount           $ 300,000                              
Debt Instrument, Periodic Payments, Number of Monthly Payments           8                              
Debt Instrument, Periodic Payment, Total           $ 33,333                              
Debt Instrument, Increase (Decrease), Net, Total $ 33,333