Note 5 - Other Real Estate Owned - Roll Forward of OREO (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Beginning balance	$ 143	$ 497	$ 186	$ 1,226	$ 1,226
New foreclosed properties	0	30	33	76
Valuation adjustments	0	(17)	0	(38)	0
Sales and other reductions	(33)	(241)	(109)	(995)
Ending balance	$ 110	$ 269	$ 110	$ 269	$ 186