Note 9 - Fair Values - Fair Value of Assets Measured on a Non-recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Other real estate owned	$ 8	$ 35
Fair Value, Nonrecurring [Member]
Collateral dependent impaired loans	2,404	33
Other real estate owned	8	35
Total assets measured at fair value	2,412	68
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Collateral dependent impaired loans	0	0
Other real estate owned	0	0
Total assets measured at fair value	0	0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Collateral dependent impaired loans	0	0
Other real estate owned	0	0
Total assets measured at fair value	0	0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Collateral dependent impaired loans	2,404	33
Other real estate owned	8	35
Total assets measured at fair value	$ 2,412	$ 68