Note 14 - Concentrations of Credit Risk (Details Textual) - Credit Concentration Risk [Member] - Commercial Real Estate, Loan Portfolio [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Commercial Real Estate Loans [Member]
Concentration Risk, Percentage	50.00%	51.00%
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 405,722	$ 393,115
College Housing and Professional Office Buildings [Member]
Concentration Risk, Percentage	25.00%
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 201,858	$ 189,421
Residential [Member]
Concentration Risk, Percentage	26.00%	24.00%
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 208,977	$ 181,782