Note 9 - Fair Value Measurements - Fair Value Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt securities	$ 27,426	$ 28,571
Fair Value, Inputs, Level 1 [Member]
Debt securities	0	0
Fair Value, Inputs, Level 2 [Member]
Debt securities	27,426	28,571
Fair Value, Inputs, Level 3 [Member]
Debt securities	0	0
US States and Political Subdivisions Debt Securities [Member]
Debt securities	11,310	11,400
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt securities	0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt securities	11,310	11,400
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Debt securities	0	0
Asset-Backed Securities [Member]
Debt securities	7,547	7,535
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Debt securities	0	0
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Debt securities	7,547	7,535
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Debt securities	0	0
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Debt securities	8,569	9,636
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 1 [Member]
Debt securities	0	0
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 2 [Member]
Debt securities	8,569	9,636
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 3 [Member]
Debt securities	$ 0	$ 0