Note 20 - Assets and Liabilities Measured and Reported at Fair Value - Assets Measured at Fair Value on a Non-recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other real estate owned	$ (7)	$ 102	$ 39
Fair Value, Nonrecurring [Member]
Impaired loans	7,253	925
Impaired loans	(20)	(514)
Other real estate owned	493	239
Other real estate owned	(70)	(32)
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans	0	0
Other real estate owned	0	0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans	0	0
Other real estate owned	0	0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans	7,253	925
Other real estate owned	$ 493	$ 239