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			9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020		Sep. 30, 2021	Sep. 30, 2020
Revenue Benchmark [Member] | Distributor A [Member]
Concentration risk	24.00%	22.00%		26.00%	23.00%
Revenue Benchmark [Member] | Distributor B [Member]
Concentration risk	15.00%	11.00%	[1]	16.00%
Revenue Benchmark [Member] | Distributor C [Member]
Concentration risk	12.00%
Revenue Benchmark [Member] | Customer A (Direct) [Member]
Concentration risk		14.00%			11.00%
Accounts Receivable [Member] | Distributor A [Member]
Concentration risk				17.00%	24.00%
Accounts Receivable [Member] | Distributor B [Member]
Concentration risk				18.00%	21.00%
Accounts Receivable [Member] | Value Added Reseller A [Member]
Concentration risk				15.00%	13.00%
Accounts Receivable [Member] | Customer A (Direct) [Member]
Concentration risk					10.00%

[1] Represents less than 10%.