Note 14 - Major Customers and Related Information - Disaggregation of Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues	$ 1,805	$ 1,007	$ 5,280	$ 2,529
Americas [Member]
Revenues	1,088	384	2,837	788
Europe, Middle East and Africa [Member]
Revenues	745	51	2,424	653
Asia Pacific [Member]
Revenues	$ (28)	$ 572	$ 19	$ 1,088