Note 9 - Geographic Information and Major Customer Data - Major Customers Data As Percentage of Total Revenues (Details) - Revenue from Contract with Customer Benchmark [Member] - Customer Concentration Risk [Member]	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Customer A [Member]
Percentage of total revenues	27.00%		21.00%
Customer B [Member]
Percentage of total revenues		0.00%	10.00%	0.00%
Customer C [Member]
Percentage of total revenues		20.00%		18.00%
Customer D [Member]
Percentage of total revenues		18.00%		11.00%