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Note 7 - Segment, Significant Customers and Geographic Information - Customers with Sales and Accounts Receivable Greater Than 10% (Details) - Customer Concentration Risk [Member]
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Revenue Benchmark [Member] | Distributor A [Member]      
Concentration risk 24.00% 26.00%  
Revenue Benchmark [Member] | Distributor B [Member]      
Concentration risk 18.00% 16.00% [1]  
Revenue Benchmark [Member] | Distributor C [Member]      
Concentration risk 11.00%    
Accounts Receivable [Member] | Distributor A [Member]      
Concentration risk 20.00%   26.00%
Accounts Receivable [Member] | Distributor B [Member]      
Concentration risk 22.00%   17.00%
Accounts Receivable [Member] | Value Added Reseller A [Member]      
Concentration risk     12.00%
[1] Represents less than 10%.