Note 11 - Assets and Liabilities Measured and Reported at Fair Value (Details Textual) $ in Thousands	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Selling and Closing Costs [Member] | Minimum [Member]
Impaired Loans, Measurement Input	0.08
Other Real Estate Owned, Measurement Input	0.08
Selling and Closing Costs [Member] | Maximum [Member]
Impaired Loans, Measurement Input	0.10
Other Real Estate Owned, Measurement Input	0.10
Fair Value, Nonrecurring [Member]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 0	$ 0