Note 7 - Fair Value - Financial Assets At Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Securities	$ 239,549	$ 153,203
US States and Political Subdivisions Debt Securities [Member]
Securities	926	934
US Treasury and Government [Member]
Securities	92,709
US Government-sponsored Enterprises Debt Securities [Member]
Securities	141,676	35,391
Residential Mortgage-Backed Securities [Member]
Securities	3,266	3,367
Collateralized Mortgage-Backed Securities [Member]
Securities	972	1,003
US Treasury Securities [Member]
Securities	92,709	112,508
Fair Value, Inputs, Level 1 [Member]
Securities	92,709	112,508
Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 1 [Member] | US Treasury and Government [Member]
Securities	92,709
Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 1 [Member] | Residential Mortgage-Backed Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage-Backed Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Securities		112,508
Fair Value, Inputs, Level 2 [Member]
Securities	146,840	40,695
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities	926	934
Fair Value, Inputs, Level 2 [Member] | US Treasury and Government [Member]
Securities	0
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Securities	141,676	35,391
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage-Backed Securities [Member]
Securities	3,266	3,367
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage-Backed Securities [Member]
Securities	972	1,003
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Securities		0
Fair Value, Inputs, Level 3 [Member]
Securities	0	0
Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 3 [Member] | US Treasury and Government [Member]
Securities	0
Fair Value, Inputs, Level 3 [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 3 [Member] | Residential Mortgage-Backed Securities [Member]
Securities	0	0
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage-Backed Securities [Member]
Securities	$ 0	0
Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member]
Securities		$ 0