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Note 8 - Noncontrolling Interest - Clyra Medical (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Sep. 26, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Proceeds from Issuance of Common Stock   $ 168,000  
Long-term Debt, Excluding Current Maturities, Total   $ 1,242,000   $ 1,292,000
Preferred Stock, Shares Outstanding, Ending Balance   0   0
Convertible Notes Issued by Clyra Medical Maturing on June 17, 2020 [Member]        
Long-term Debt, Excluding Current Maturities, Total   $ 1,007,000   $ 1,007,000
Clyra [Member]        
Proceeds from Issuance of Common Stock   $ 110,000    
Shares Issued, Price Per Share   $ 550    
Clyra Medical Technology Inc [Member] | Sanatio [Member]        
Common Stock, Shares, Outstanding, Ending Balance   1,690    
Preferred Stock, Dividend Rate, Percentage   8.00%    
Preferred Shares Dividend, Period   5 years    
Dividends Payable, Current   $ 200,000    
Clyra Medical Technology Inc [Member] | Sanatio [Member] | Preferred Class A [Member]        
Preferred Stock, Shares Outstanding, Ending Balance   9,830    
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      
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] | Convertible Notes Issued by Clyra Medical Maturing on June 17, 2020 [Member]        
Long-term Debt, Excluding Current Maturities, Total   $ 1,007,000    
Scion Acquisition [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%      
Scion Acquisition [Member] | Clyra Medical Technology Inc [Member]        
Proceeds from Issuance of Common Stock   $ 1,110,000    
Shares Issued, Price Per Share   $ 200    
Scion Acquisition [Member] | Clyra Acquisition, Common Stock [Member]        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 10,000 15,500   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