Note 6 - Foreclosed Real Estate - Net Loss on Foreclosed Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net (gain) loss on sales	$ (114)	$ 23	$ (3)
Direct write-downs	284	419	263
Operating expenses, net of income	129	34	56
	$ 299	$ 476	$ 316