Note 13 - Major Customers and Related Information - Disaggregation of Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues	$ 1,202	$ 1,165	$ 1,913	$ 2,764
Americas [Member]
Revenues	1,168	1,090	1,878	2,285
Europe, Middle East and Africa [Member]
Revenues	35	73	36	247
Asia Pacific [Member]
Revenues	$ (1)	$ 2	$ (1)	$ 232