Note 13 - Segment Information - Assets by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue	$ 127,982	$ 119,686	$ 117,559
Long-lived assets	81,528	79,621	75,057
Total assets	110,685	108,032	127,316
UNITED STATES
Revenue	124,369	115,451	112,885
Long-lived assets	78,906	77,330	72,562
Total assets	95,668	91,080	110,785
CANADA
Revenue	3,613	4,235	4,674
Long-lived assets	2,622	2,291	2,495
Total assets	$ 15,017	$ 16,952	$ 16,531