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Note 2 - Summary of Significant Accounting Policies - Revenues and Accounts Receivable From Major Distribution Partners and Customers (Details) - Customer Concentration Risk [Member] - Accounts Receivable [Member]
9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Distributor A [Member]    
Accounts receivable, concentration risk 24.00% 11.00%
Distributor B [Member]    
Accounts receivable, concentration risk   13.00%
Major U.S. Retailer A [Member]    
Accounts receivable, concentration risk 20.00% 33.00%