Note 6 - Fair Value Measurements - Balances of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Fair value, available for sale securities	$ 227,792	$ 217,538
Fair Value, Recurring [Member]
Fair value, available for sale securities	227,792	217,538
Derivatives - cash flow hedges	2,316	2,292
Total assets	230,108	219,830
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value, available for sale securities	0	0
Derivatives - cash flow hedges	0	0
Total assets	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair value, available for sale securities	227,792	217,538
Derivatives - cash flow hedges	2,316	2,292
Total assets	230,108	219,830
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair value, available for sale securities	0	0
Derivatives - cash flow hedges	0	0
Total assets	0	0
US Treasury Securities [Member]
Fair value, available for sale securities	42,034	37,338
US Treasury Securities [Member] \| Fair Value, Recurring [Member]
Fair value, available for sale securities	42,034	37,338
US Treasury Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value, available for sale securities	0	0
US Treasury Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair value, available for sale securities	42,034	37,338
US Treasury Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair value, available for sale securities	0	0
US Agency and Mortgage-backed Securities [Member]
Fair value, available for sale securities	126,481	122,797
US Agency and Mortgage-backed Securities [Member] \| Fair Value, Recurring [Member]
Fair value, available for sale securities	126,481	122,797
US Agency and Mortgage-backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value, available for sale securities	0	0
US Agency and Mortgage-backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair value, available for sale securities	126,481	122,797
US Agency and Mortgage-backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair value, available for sale securities	0	0
Municipal Bonds [Member] \| Fair Value, Recurring [Member]
Fair value, available for sale securities	56,811	56,446
Municipal Bonds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value, available for sale securities	0	0
Municipal Bonds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair value, available for sale securities	56,811	56,446
Municipal Bonds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair value, available for sale securities	0	0
Corporate Debt Securities [Member]
Fair value, available for sale securities	2,466	957
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member]
Fair value, available for sale securities	2,466	957
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value, available for sale securities	0	0
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair value, available for sale securities	2,466	957
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair value, available for sale securities	$ 0	$ 0