Note 14 - Federal and State Income Taxes (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Unrecognized tax benefits that would impact effective tax rate		$ 1,700
Unrecognized tax benefits, interest on income taxes accrued		$ 236	$ 277
Increase in capitalized costs	$ 88,000
Increase in the deferred tax asset for premises and equipment	$ 22,200
Effective income tax rate		21.00%	21.00%	21.00%
Domestic Tax Authority [Member]
Deferred tax assets, operating loss carryforwards, subject to expiration		$ 4,800
Additional deferred tax assets, operating loss carryforwards, subject to expiration		1,800
Domestic Tax Authority [Member] | Community National And CNB [Member]
Deferred tax assets, operating loss carryforwards, subject to expiration		3,000
State and Local Jurisdiction [Member]
Deferred tax assets, operating loss carryforwards, subject to expiration		10,900
Additional deferred tax assets, operating loss carryforwards, subject to expiration		8,800
State and Local Jurisdiction [Member] | Community National And CNB [Member]
Deferred tax assets, operating loss carryforwards, subject to expiration		$ 2,100