Note 11 - Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2023	Jan. 01, 2023	Dec. 31, 2022
Deferred tax assets
Allowance for credit losses on loans	$ 1,859,000		$ 2,212,000
Net unrealized holding losses on investment securities available-for-sale	17,692,000		21,565,000
Net unrealized holding losses on investment rate swaps	367,000		0
Fair value adjustment on equity securities	0		10,000
Non-accrual interest income	170,000		52,000
Leasing liability	637,000		678,000
Deferred revenue	0		7,000
Incurred but not reported medical expense	27,000		28,000
Bonus	88,000		128,000
State net operating loss carryforward	30,000		0
Other	61,000		48,000
Total deferred tax assets	20,931,000	$ 4,540,000	24,728,000
Deferred tax liabilities
Deferred loan income	487,000		459,000
Depreciation	215,000		225,000
Mortgage servicing rights	87,000		98,000
Fair value adjustment on equity securities	61,000		0
Fair value remeasurements on interest rate swap	12,000		0
Prepaid expenses	203,000		232,000
Right of use asset	572,000		611,000
Other	0		18,000
Total deferred tax liabilities	1,637,000		1,643,000
Valuation allowance	4,000		8,000
Net deferred tax asset	$ 19,290,000		$ 23,077,000