Note 3 - Supplemental Balance Sheet Information (in Thousands) - Goodwill Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Balance	$ 3,760	$ 3,784
Change in goodwill due to impact of foreign currency	12	(24)
Purchase of interest in subsidiary	394
Balance	4,166	3,760
UNITED STATES
Balance	3,150	3,150
Change in goodwill due to impact of foreign currency		0
Balance	3,150	3,150
International [Member]
Balance	610	634
Change in goodwill due to impact of foreign currency	12	(24)
Purchase of interest in subsidiary	394
Balance	$ 1,016	$ 610