Note 12 - Business Segment and Geographic Financial Data - Geographic Segment Financial Data (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenues	$ 24,261	$ 22,550
Assets	49,974	30,088
UNITED STATES
Revenues	19,515	18,622
Assets	46,271	24,524
Non-US [Member]
Revenues	4,746	3,928
Assets	$ 3,703	$ 5,564