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Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Total sales, net $ 3,265 $ 3,826 $ 10,999 $ 10,761
Avenova Spray [Member]        
Total sales, net 2,064 1,939 5,759 5,778
DERMAdoctor [Member]        
Total sales, net 784 1,319 2,645 3,115
NeutroPhase [Member]        
Total sales, net 0 0 1,043 657
Other Products [member]        
Total sales, net 407 558 1,524 1,193
Total Product Revenue [Member]        
Total sales, net 3,255 3,816 10,971 10,743
Product and Service, Other [Member]        
Total sales, net $ 10 $ 10 $ 28 $ 18