Note 4 - Real Estate Owned and Repossessed Assets - Activity in Real Estate Owned and Repossessed Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Beginning balance	$ 154	$ 124
Loans transferred to foreclosed assets	529	412
Sales	(561)	(376)
Market value adjustments	0	(10)
Net gain (loss) on sales	(120)	4
Ending balance	$ 2	$ 154