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, 2023	Dec. 31, 2022
Residential Real Estate Loans [Member]
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 241,564	$ 221,052
Concentration Risk, Percentage	28.00%	26.00%
Commercial Real Estate Loans [Member]
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 419,130	$ 437,888
Concentration Risk, Percentage	49.00%	51.00%
College Housing and Professional Office Buildings [Member]
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 167,794	$ 196,398
Concentration Risk, Percentage	20.00%	23.00%