Note 7 - Goodwill and Other Intangible Assets - Goodwill and Intangible Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance, goodwill	$ 85,048,000	$ 84,002,000
Balance, intangibles	6,091,000
Amortization, intangibles	(1,464,000)	(1,637,000)	$ (1,398,000)
Balance, goodwill	85,048,000	85,048,000	84,002,000
Balance, intangibles	4,627,000	6,091,000
Core deposit intangibles, net	4,627,000	6,091,000
Goodwill, gross	85,048,000	85,048,000
Goodwill, net	85,048,000	85,048,000	$ 84,002,000
Core Deposits [Member]
Balance, intangibles	6,091,000
Balance, intangibles	4,627,000	6,091,000
Core deposit intangibles, gross	19,708,000	19,708,000
Core deposit intangibles, accumulated amortization	(15,081,000)	(13,617,000)
Core deposit intangibles, net	$ 4,627,000	$ 6,091,000