Note 9 - Fair Values - Fair Value of Assets Measured on a Non-recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Other real estate owned		$ 31
Fair Value, Nonrecurring [Member]
Collateral dependent impaired loans	10,429
Total assets measured at fair value	10,429	31
Other real estate owned		31
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Collateral dependent impaired loans
Total assets measured at fair value
Other real estate owned
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Collateral dependent impaired loans
Total assets measured at fair value
Other real estate owned
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Collateral dependent impaired loans	10,429
Total assets measured at fair value	$ 10,429	31
Other real estate owned		$ 31