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
	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%