Note 12 - Geographic Information and Major Customer and Product Data - Major Customers Data As Percentage of Total Revenues (Details) - Revenue from Contract with Customer Benchmark [Member] - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Customer A [Member]
Percentage of total revenues	15.00%		15.00%	23.00%
Customer B [Member]
Percentage of total revenues				17.00%
Customer C [Member]
Percentage of total revenues	19.00%	[1]	19.00%		[1]

[1] Less than 10%