Note 16 - Assets and Liabilities Measured and Reported at Fair Value - Significant Unobservable Inputs (Details) - Impaired Loans [Member] - Fair Value, Inputs, Level 3 [Member] - Appraisal Discount Method [Member] $ in Thousands	Mar. 31, 2019 USD ($)
Impaired loans - collateral dependent, fair value	$ 369
Other real estate owned	$ 239
Weighted Average [Member]
Impaired loans - collateral dependent, weighted average of input	9.8
Other real estate owned - collateral dependent, weighted average of input	22