Note 16 - Assets and Liabilities Measured and Reported at Fair Value - Assets Measured at Fair Value on a Non-recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Other real estate owned			$ 63	$ 109
Fair Value, Nonrecurring [Member]
Impaired loans	$ 348		348		$ 925
Impaired loans	0	$ 0	0	874
Other real estate owned	239		239		239
Other real estate owned	0	$ 0	0	$ 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans	0		0		0
Other real estate owned	0		0		0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans	0		0		0
Other real estate owned	0		0		0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans	348		348		925
Other real estate owned	$ 239		$ 239		$ 239