Note 10 - Acquisition - Pro Forma Revenue and Earnings (Details) - Merchants Holding Company [Member] - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019		Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net interest income	$ 13,495		$ 12,929	$ 26,694	$ 25,603
Net income	$ 3,644	[1]	$ 4,011	$ 5,913	$ 7,603

[1] Net income for the three months ended March 31, 2019 includes acquisition-related costs of $1.9 million.