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Note 2 - Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 12 Months Ended
Mar. 20, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Accounts Receivable, Allowance for Credit Loss, Current   $ 24,000   $ 24,000  
Inventory Valuation Reserves, Ending Balance   3,000   3,000  
Security Deposit   35,000      
Operating Lease, Right-of-Use Asset   386,000   $ 411,000  
Impairment of Long-Lived Assets Held-for-use   0 $ 0    
Payments to Acquire Interest in Joint Venture   $ 100,000    
Canadian Government Grants [Member]          
Number of Grants Received   75      
Grants Receivable   $ 3.60      
Canadian Government Grants [Member] | Minimum [Member]          
Grant Term (Month)   180 days      
Canadian Government Grants [Member] | Maximum [Member]          
Grant Term (Month)   1 year 180 days      
Accounting Standards Update 2016-02 [Member]          
Operating Lease, Right-of-Use Asset         $ 399,000
Operating Lease, Liability, Total         $ 399,000
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member]          
Number of Major Customers   3 3    
Customer Concentration Risk [Member] | Accounts Receivable [Member]          
Number of Major Customers   1   2  
Odin Co Ltd [Member]          
Payments to Acquire Interest in Joint Venture $ 100,000        
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 40.00% 40.00%      
Income (Loss) from Equity Method Investments, Total   $ (1,000)      
Clyra Medical Technology Inc [Member] | Biolargo [Member]          
Noncontrolling Interest, Ownership Percentage by Parent   36.00%   36.00%  
Tomorrow Water [Member] | Odin Co Ltd [Member]          
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 30.00%        
BKT and Tomorrow Water [Member] | Odin Co Ltd [Member]          
Payments to Acquire Interest in Joint Venture $ 150,000        
BKT Tech Co Ltd [Member] | Odin Co Ltd [Member]          
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 30.00%