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Note 9 - Noncontrolling Interest - Clyra Medical (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Other Ownership Interests [Table Text Block]
Shareholder
 
Shares
   
Percent
 
BioLargo, Inc.
   
26,202
     
36
%
Sanatio Capital
   
15,064
     
21
%
Scion Solutions
(1)
   
15,500
     
21
%
Other
   
15,897
     
22
%
Total
 
 
72,663