Note 10 - Segment Information - Assets by Geographic Area (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Long-lived assets	$ 80,084	$ 81,528
Total assets	116,781	110,685
UNITED STATES
Long-lived assets	77,621	78,906
Total assets	101,134	95,668
CANADA
Long-lived assets	2,463	2,622
Total assets	$ 15,647	$ 15,017