Note 4 - Premises and Equipment, Net - Summary of Premises and Equipment (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Property, plant and equipment, gross	$ 93,386,000	$ 90,338,000
Less: accumulated depreciation	41,095,000	38,862,000
Premises and equipment, net	52,291,000	51,476,000
Land and Land Improvements [Member]
Property, plant and equipment, gross	13,060,000	13,532,000
Building [Member]
Property, plant and equipment, gross	56,637,000	53,865,000
Furniture and Fixtures [Member]
Property, plant and equipment, gross	$ 23,689,000	$ 22,941,000