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Note 9 - Noncontrolling Interest - Clyra Medical (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2020
Dec. 17, 2018
Sep. 26, 2018
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 17, 2021
Dec. 31, 2020
Stock Issued During Period, Value, New Issues       $ 2,106,000 $ 901,000      
Share Price (in dollars per share)       $ 0.23   $ 0.23 $ 0.23  
Clyra Medical [Member]                
Stock Issued During Period, Value, New Issues       $ 50,000        
Shares Issued, Price Per Share (in dollars per share)       $ 310   $ 310    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)       777 1,945 777   11,411
Share Price (in dollars per share)       $ 310   $ 310    
Clyra Medical [Member] | Vendors and Employees [Member]                
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)       $ 1        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       10 years        
Clyra Medical [Member] | Vendors and Employees [Member] | Share-based Payment Arrangement, Option [Member]                
Share-based Payment Arrangement, Expense       $ 161,000 $ 420,000      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Discount Rate       30.00%        
Clyra Medical [Member] | Revolving Credit Facility [Member] | Vernal Bay Capital Group, LLC [Member] | Inventory Line of Credit [Member]                
Debt Instrument, Interest Rate, Stated Percentage 15.00%              
Debt Instrument, Term (Year) 1 year              
Line of Credit Facility, Maximum Borrowing Capacity $ 1,000,000              
Proceeds from Lines of Credit, Total           $ 260,000    
Line of Credit Facility, Covenant, Additional Draws, Maximum Percentage of Total Principal Outstanding Allowed 50.00%              
Line of Credit Facility, Covenant, Additional Draws, Minimum Amount Allowed $ 200,000              
Line of Credit Facility, Monthly Percentage of Gross Product Sales Required to be Used as Payment of Debt on First 180 Days 30.00%              
Line of Credit Facility, Monthly Percentage of Gross Product Sales Required to be Used as Payment of Debt after the First 180 Days 60.00%              
Stock Issued During Period, Shares, Commitment Fee (in shares) 323              
Stock Issued During Period, Value, Commitment Fee $ 70,000              
Repayments of Lines of Credit       $ 24,000        
Line of Credit, Current       200,000   200,000    
Clyra Medical [Member] | Scion Acquisition [Member]                
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)     21,000          
Business Combination, Consideration Transferred, Liabilities Incurred     $ 1,250,000          
Business Acquisition, Base Capital Requirement for Escrow Release   $ 1,000,000 $ 1,000,000          
Business Acquisition, Gross Revenue, Tranche One   100,000            
Business Acquisition, Gross Revenue, Tranche Two   100,000            
Business Acquisition, Gross Revenue, Tranche Three   500,000            
Business Acquisition, Gross Revenue, Tranche Five   $ 2,000,000            
Clyra Medical [Member] | Scion Acquisition [Member] | Clyra Acquisition, Common Stock [Member]                
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)   15,500 10,000          
Clyra Medical [Member] | Scion Acquisition [Member] | Clyra Acquisition, Common Stock Redeemable for BioLargo Common Shares [Member]                
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)     7,142,858          
Clyra Medical [Member] | Scion Solutions [Member]                
Debt Instrument, Interest Rate, Stated Percentage     5.00%          
Debt Instrument, Percent of Investment Proceeds     25.00%          
Debt Instrument, Percent of Gross Revenue     5.00%          
Notes Payable, Current, Total       $ 1,007,000   $ 1,007,000   $ 1,007,000
Clyra Medical [Member] | Clyra Acquisition, Common Stock [Member]                
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)       9,300        
Clyra Medical Technologies [Member]                
Noncontrolling Interest, Ownership Percentage by Parent       45.00%   45.00%   45.00%