Note 3 - Revenue - Revenues Disaggregated by Geography (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues	$ 6,368	$ 5,218	$ 11,903	$ 10,251
UNITED STATES
Revenues	4,279	4,588	7,967	9,051
Latin America [Member]
Revenues	60	142	129	217
Europe [Member]
Revenues	922	301	1,326	676
Asia [Member]
Revenues	1,107	187	2,481	307
Non-US [Member]
Revenues	$ 2,089	$ 630	$ 3,936	$ 1,200