Note 7 - Fair Value - Financial Assets At Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Securities	$ 222,906	$ 153,203
US States and Political Subdivisions Debt Securities [Member]
Securities	925	934
US Treasury and Government [Member]
Securities	75,059
US Government-sponsored Enterprises Debt Securities [Member]
Securities	142,816	35,391
Residential Mortgage-Backed Securities [Member]
Securities	3,184	3,367
Collateralized Mortgage-Backed Securities [Member]
Securities	922	1,003
US Treasury Securities [Member]
Securities	75,059	112,508
Fair Value, Inputs, Level 1 [Member]
Securities	75,059	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	75,059
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	147,847	40,695
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities	925	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	142,816	35,391
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage-Backed Securities [Member]
Securities	3,184	3,367
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage-Backed Securities [Member]
Securities	922	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