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Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Total sales, net $ 3,124 $ 3,273
Avenova Spray [Member]    
Total sales, net 1,937 1,839
DERMAdoctor [Member]    
Total sales, net 785 1,043
NeutroPhase [Member]    
Total sales, net 0 148
Other Products [member]    
Total sales, net 395 237
Total Product Revenue [Member]    
Total sales, net 3,117 3,267
Product and Service, Other [Member]    
Total sales, net $ 7 $ 6