Note 11 - Fair Value Measurement - Fair Value of Financial Assets and Liabilities Measure on Non-recurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loans held for sale	$ 85	$ 1,587
Other real estate owned	1,893	3,249
Fair Value, Inputs, Level 1 [Member]
Loans held for sale
Other real estate owned
Fair Value, Inputs, Level 2 [Member]
Loans held for sale	85	1,587
Other real estate owned	331
Fair Value, Inputs, Level 3 [Member]
Loans held for sale
Other real estate owned	$ 1,562	$ 3,249