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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss $ 3,000   $ 3,000   $ 19,000
Inventory Valuation Reserves 446,000   446,000   499,000
Goodwill and Intangible Asset Impairment 0     $ 0  
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill) 0 $ 0      
Business Combination, Contingent Consideration, Liability 0   $ 0   0
Impairment, Long-Lived Asset, Held-for-Use 0 0      
Payment for Product Supply Period (Day)     30 days    
Deferred Revenue 4,000   $ 4,000   $ 4,000,000
Advertising Expense $ 300 $ 400 $ 600 $ 1,000.0  
Equipment [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life (Year) 5 years   5 years    
Equipment [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life (Year) 7 years   7 years    
Computer Equipment and Software [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life (Year) 3 years   3 years    
Computer Equipment and Software [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life (Year) 5 years   5 years    
Furniture and Fixtures [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life (Year) 5 years   5 years    
Furniture and Fixtures [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life (Year) 7 years   7 years    
Revenue from Contract with Customer Benchmark [Member] | Distributor Concentration Risk [Member] | Avenova Spray [Member]          
Concentration Risk, Percentage 61.00% 69.00% 68.00% 75.00%