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Note 6 - Goodwill and Acquired Intangible Assets (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2006
Goodwill, Ending Balance	$ 59,946,000	$ 60,506,000	$ 52,870,000
Amortization of Intangible Assets, Total	$ 1,307,000	1,498,000	353,000
Core Deposits [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Month)	120 months
Amortization of Intangible Assets, Total	$ 1,307,000	1,498,000
Valley Ridge Financial Corp. [Member]
Goodwill, Ending Balance				$ 13,700,000
County Bank Corp [Member]
Goodwill, Ending Balance			$ 38,900,000
County Bank Corp [Member] | Core Deposits [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Month)	10 years
Community Shores Bank Corporation [Member]
Goodwill, Ending Balance		$ 7,300,000
Community Shores Bank Corporation [Member] | Core Deposits [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Month)	8 years

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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