Note 23 - Acquisition - Pro Forma Revenue and Earnings (Details) - Merchants Holding Company [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
Net interest income	$ 52,948		$ 46,592	$ 41,287
Net income	$ 16,313	[1]	$ 8,069	$ 6,566

[1] Net income for 2018 includes acquisition-related costs of $1.3 million for both entities