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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 8   $ 8   $ 0
Inventory Valuation Reserves 455   455   641
Goodwill and Intangible Asset Impairment, Total     $ 0   $ 0
Payment for Product Supply Period (Day)     30 days    
Advertising Expense $ 500 $ 800 $ 1,600 $ 2,300  
Equipment [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life (Year)     5 years    
Equipment [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life (Year)     7 years    
Computer Equipment and Software [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life (Year)     3 years    
Computer Equipment and Software [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life (Year)     5 years    
Furniture and Fixtures [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life (Year)     5 years    
Furniture and Fixtures [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life (Year)     7 years    
Revenue from Contract with Customer Benchmark [Member] | Distributor Concentration Risk [Member] | Avenova Spray [Member]          
Concentration Risk, Percentage 70.00% 63.00% 73.00% 65.00%