Note 6 - Foreclosed Real Estate - Net Loss on Foreclosed Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net (gain) loss on sales	$ (3)	$ 0	$ 4
Direct write-downs	(0)	5	(0)
Operating expenses, net of income	0	14	9
Ending balance	$ (3)	$ 19	$ 13