Note 10 - Segment Information - Assets by Geographic Area (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Long-lived assets	$ 79,880	$ 81,528
Total assets	127,246	110,685
UNITED STATES
Long-lived assets	77,381	78,906
Total assets	118,536	95,668
CANADA
Long-lived assets	2,499	2,622
Total assets	$ 8,710	$ 15,017