Note 8 - Fair Value Measurements and Disclosures - Change in Fair Value of Other Real Estate (Details) - Real Estate Acquired in Satisfaction of Debt [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Balance	$ 7,453	$ 8,943
Loans transferred to ORE		1,707
Sales	(782)	(2,755)
Writedowns	(98)	(442)
Balance	$ 6,573	$ 7,453