Note 13 - Business Segment Reporting - Revenue by Major Source (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues	$ 25,240	$ 24,909	$ 21,360
UNITED STATES
Revenues	24,509	23,584	19,486
Non-US [Member]
Revenues	$ 731	$ 1,325	$ 1,874