Note 1 - Organization and Significant Accounting Policies - Concentrations Risk by Geographic Locations (Details) - Revenue Benchmark [Member] - Geographic Concentration Risk [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue by customers’ geographic locations, percentage	100.00%	100.00%	100.00%	100.00%
North America [Member]
Revenue by customers’ geographic locations, percentage	88.00%	84.00%	87.00%	86.00%
EMEA [Member]
Revenue by customers’ geographic locations, percentage	9.00%	13.00%	10.00%	12.00%
Geographic, Other [Member]
Revenue by customers’ geographic locations, percentage	3.00%	3.00%	3.00%	2.00%