Note 11 - Segment and Enterprise-wide Disclosures - Long-term Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Long-term Assets	$ 30,062	$ 14,102
UNITED STATES
Long-term Assets	24,885	11,006
AUSTRALIA
Long-term Assets	1,499	1,460
FRANCE
Long-term Assets	1,089	1,071
GERMANY
Long-term Assets	1,405	430
Other Countries [Member]
Long-term Assets	$ 1,184	$ 135