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Note 2 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Total sales, net $ 4,610 $ 3,662 $ 7,734 $ 6,935
Avenova Spray [Member]        
Total sales, net 1,758 2,001 3,695 3,840
DERMAdoctor [Member]        
Total sales, net 1,076 752 1,861 1,795
NeutroPhase [Member]        
Total sales, net 1,043 509 1,043 657
Other Products [member]        
Total sales, net 722 398 1,117 635
Total Product Revenue [Member]        
Total sales, net 4,599 3,660 7,716 6,927
Product and Service, Other [Member]        
Total sales, net $ 11 $ 2 $ 18 $ 8