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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] | 6 Months Ended | 12 Months Ended
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Jun. 30, 2022 | Dec. 31, 2021
Distributor A [Member] |  |
Accounts receivable, concentration risk | 38.00% | 11.00%
Distributor B [Member] |  |
Accounts receivable, concentration risk | 13.00% | 13.00%
Amazon [Member] |  |
Accounts receivable, concentration risk | 12.00% |
Major U.S. Retailer A [Member] |  |
Accounts receivable, concentration risk | 10.00% |
Major U.S. Retailer B [Member] |  |
Accounts receivable, concentration risk |  | 33.00%

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