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Note 16 - Sale of 100% Membership Interest in Teco Facility and Nopah License (Details Textual) - USD ($)
12 Months Ended
Mar. 24, 2020
Nov. 27, 2019
Nov. 15, 2019
Mar. 31, 2020
Dec. 06, 2019
Teco [Member]          
Sale of Stock, Percentage of Ownership 100.00%     100.00%  
Proceeds from Divestiture of Businesses $ 4,000,000        
Financing Receivable, after Allowance for Credit Loss, Total $ 4,000,000        
Notes Receivable, Interest Rate 8.00%        
Notes Receivable, Term of Monthly Installments (Month) 3 years        
Line of Credit [Member]          
Line of Credit Facility, Maximum Borrowing Capacity   $ 470,000      
Teco Note [Member] | Line of Credit [Member]          
Line of Credit Facility, Maximum Borrowing Capacity         $ 470,000
Debt Instrument, Interest Rate, Stated Percentage         8.00%
Teco [Member]          
Sale of Stock, Percentage of Ownership   75.00% 75.00%    
Sale of Stock, Consideration Received on Transaction   $ 3,000,000 $ 3,000,000    
Sale of Stock, Additional Earn-out Payments   $ 3,000,000 $ 3,000,000    
GB Sciences Nopah, LLC [Member]          
Sale of Stock, Percentage of Ownership   100.00%      
Sale of Stock, Consideration Received on Transaction   $ 300,000