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Note 2 - Summary of Significant Accounting Policies (Details Textual)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jan. 01, 2019
USD ($)
Accounts Receivable, Allowance for Credit Loss, Current $ 24,000    
Inventory Valuation Reserves, Ending Balance 3,000 $ 3,000  
Security Deposit 35,000    
Impairment of Long-Lived Assets Held-for-use 0 0  
Operating Lease, Right-of-Use Asset 411,000  
Operating Lease, Liability, Total $ 411,000    
Accounting Standards Update 2016-02 [Member]      
Operating Lease, Right-of-Use Asset     $ 399,000
Operating Lease, Liability, Total     $ 399,000
Canadian Government Grants [Member]      
Number of Grants Received 75    
Grants Receivable $ 3,000,000    
Canadian Government Grants [Member] | Minimum [Member]      
Grant Term 180 days    
Canadian Government Grants [Member] | Maximum [Member]      
Grant Term 1 year 180 days    
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member]      
Number of Major Customers 0 1  
Customer Concentration Risk [Member] | Accounts Receivable [Member]      
Number of Major Customers 3 2  
Clyra Medical Technology Inc [Member] | Biolargo [Member]      
Noncontrolling Interest, Ownership Percentage by Parent 36.00%