Note 11 - Fair Value of Financial Instruments - Assets and Liabilities Carried at Fair Value on a Non-recurring Basis, and the Method Used to Determine Their Fair Value (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Impaired loans	$ 778	$ 4,111
Other repossesed assets	239	35
Total assets	1,017	4,146
Fair Value, Inputs, Level 1 [Member]
Impaired loans	0	0
Other repossesed assets	0	0
Total assets	0	0
Fair Value, Inputs, Level 2 [Member]
Impaired loans	0	0
Other repossesed assets	0	0
Total assets	0	0
Fair Value, Inputs, Level 3 [Member]
Impaired loans	778	4,111
Other repossesed assets	239	35
Total assets	$ 1,017	$ 4,146