Note 9 - Fair Values - Fair Value of Assets Measured on a Non-recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Other real estate owned	$ 58	$ 31
Fair Value, Nonrecurring [Member]
Collateral dependent impaired loans	10,171
Other real estate owned	58	31
Total assets measured at fair value	10,229	31
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Collateral dependent impaired loans
Other real estate owned
Total assets measured at fair value
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Collateral dependent impaired loans
Other real estate owned
Total assets measured at fair value
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Collateral dependent impaired loans	10,171
Other real estate owned	58	31
Total assets measured at fair value	$ 10,229	$ 31