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Note 9 - Noncontrolling Interest - Clyra Medical (Details Textual) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Dec. 17, 2018
Sep. 26, 2018
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Long-term Debt, Excluding Current Maturities, Total     $ 700,000   $ 700,000 $ 1,292,000
Consulting Services, Monthly Payment         $ 23,000  
Consulting Services, Period of Services         4 years  
Consulting Services, Three Consecutive Month Average Revenue Threshold for Consulting Fees to Accrue     250,000      
Contractual Obligation, Total     $ 1,100,000   $ 1,100,000  
Shares Issued, Price Per Share           $ 0.25
Conversion of Accrued Dividends , Amount Converted         $ 270,000  
Stock Issued During Period, Shares Issued for Conversion of Dividend         3,544  
Variable Entity [Member] | Clyra [Member]            
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage         50.00%  
Clyra [Member]            
Stock Issued During Period, Shares, New Issues         2,680  
Proceeds from Issuance of Common Stock         $ 536,000  
Shares Issued, Price Per Share     $ 200   $ 200  
Clyra Medical Technology Inc [Member] | Sanatio [Member]            
Preferred Stock, Dividend Rate, Percentage       8.00%    
Preferred Shares Dividend, Period       5 years    
Scion Acquisition [Member]            
Business Acquisition, Equity Interest Issued or Issuable, Number of 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          
Scion Acquisition [Member] | Clyra Acquisition, Common Stock [Member]            
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 15,500 10,000     15,500  
Scion Acquisition [Member] | Clyra Acquisition, Common Stock Redeemable for BioLargo Common Shares [Member]            
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares   7,142,858        
Business Combination, Shares Acquired   12,755        
Stock Redeemed Upon Vesting of 10,000 Clyra Acquisition Shares, Shares   10,000        
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable   $ 1,286,000        
Scion Solutions [Member] | Clyra [Member]            
Debt Instrument, Face Amount   $ 1,250,000        
Debt Instrument, Interest Rate, Stated Percentage   5.00%        
Debt Instrument, Percent of Investment Proceeds   25.00%        
Debt Instrument, Extension Period   1 year        
Debt Instrument, Term   1 year 180 days        
Debt Instrument, Percent of Gross Revenue   5.00%        
Long-term Debt, Excluding Current Maturities, Total     $ 1,007,000   $ 1,007,000