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Note 11 - Business Segment Information (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
2018
    
2019
  
Revenues
  
 
 
 
  
 
 
 
Odor-No-More
   $
1,123
     $
1,459
  
BLEST
    
863
      
999
  
BLEST – Intercompany revenue
    
(622
 )    
(597
 )
Total
   $
1,364
     $
1,861
  
                 
Operating loss
  
 
 
 
  
 
 
 
BioLargo corporate
   $
(4,185
 )   $
(4,248
 )
Odor-No-More
    
(433
 )    
(335
 )
Clyra Medical
    
(868
 )    
(1,233
 )
BLEST
    
(125
 )    
(152
 )
Water
    
(801
 )    
(728
 )
Total
   $
(6,412
 )   $
(6,696
 )
                 
Interest expense
  
 
 
 
  
 
 
 
BioLargo corporate
   $
(3,494
 )   $
(3,944
 )
Odor-No-More
    
—
      
(2
 )
Clyra
    
—
      
(50
 )
Total
   $
(3,494
 )   $
(3,996
 )
                 
Research and development
  
 
 
 
  
 
 
 
BioLargo corporate
   $
(1,054
 )   $
(892
 )
BLEST
    
(374
 )    
(354
 )
Clyra Medical
    
(198
 )    
(219
 )
BioLargo Water
    
(693
 )    
(610
 )
BioLargo corporate - intercompany
    
600
      
603
  
Total
   $
(1,719
 )   $
(1,472
 )
As of December 31, 2019
  
BioLargo
    
ONM
    
Clyra
    
BLEST
    
Water
    
Elimination
    
Total
  
Tangible assets
   $
1,050
     $
420
     $
3
     $
264
     $
50
     $
(59
 )   $
1,728
  
Intangible assets
    
1,893
      
—
      
—
      
—
      
—
      
—
      
1,893
  
As of December 31, 2018
  
BioLargo
    
ONM
    
Clyra
    
BLEST
    
Water
    
Elimination
    
Total
  
Tangible assets
   $
353
     $
219
     $
462
     $
230
     $
34
     $
(6
 )   $
1,292
  
Intangible assets
    
1,893
      
—
      
—
      
—
      
—
      
—
      
1,893