Note 6 - Goodwill and Intangibles - Changes in customer list intangible (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance at the beginning of period	$ 17,450	$ 9,079
Amortization of intangibles	2,266	1,692	$ 1,001
Balance at the end of the period	14,970	17,450	$ 9,079
Customer Lists [Member]
Balance at the beginning of period	1,855
Amortization of intangibles	(137)
Balance at the end of the period	1,504	1,855
Bates Companies [Member] | Customer Lists [Member]
Customer list intangible from acquisition of Bates Companies		$ 1,855
Customer list intangible from acquisition of Bates Companies - measurement period adjustment	$ (214)