Note 12 - Segment and Enterprise-wide Disclosures - Long-term Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Long-term Assets	$ 31,102	$ 30,062
UNITED STATES
Long-term Assets	27,660	24,885
AUSTRALIA
Long-term Assets	115	1,499
FRANCE
Long-term Assets	1,140	1,089
GERMANY
Long-term Assets	1,138	1,405
Other Countries [Member]
Long-term Assets	$ 1,049	$ 1,184