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Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Total sales, net $ 8,421 $ 9,934 $ 6,599
Avenova Spray [Member]      
Total sales, net 6,844 5,974 6,347
DERMAdoctor [Member]      
Total sales, net 587 0 0
KN95 Masks [Member]      
Total sales, net 0 3,124 0
NeutroPhase [Member]      
Total sales, net 368 524 209
Other Products [member]      
Total sales, net 598 294 0
Total Product Revenue [Member]      
Total sales, net 8,397 9,916 6,556
Product and Service, Other [Member]      
Total sales, net $ 24 $ 18 $ 43