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Note 16 - License, Collaboration and Distribution Agreements (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue from Contract with Customer, Including Assessed Tax $ 8,421 $ 9,934 $ 6,599
Avenova Direct [Member]      
Revenue from Contract with Customer, Including Assessed Tax 5,100 3,300 1,000
McKesson Corporation [Member] | Avenova Product [Member]      
Contract with Customer, Liability, Revenue Recognized 600 1,700 $ 4,600
McKesson Corporation [Member] | Avenova Product [Member] | Accounts Payable and Accrued Liabilities [Member]      
Contract with Customer, Liability, Total 900 700  
McKesson Corporation [Member] | Avenova Product [Member] | Prepaid Expenses and Other Current Assets [Member]      
Contract with Customer, Rebate Liability, Current $ 19 $ 144