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Note 8 - Business Combination (Details Textual) $ in Thousands	Oct. 01, 2019 USD ($) shares	Jun. 30, 2020 USD ($)
County Bank Corp ("County") [Member]
Number of Branch Offices	14
Number of Loan Office	1
Community Shores Bank Corp ("Community Shores") [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total		$ 249,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Loans		177,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits		$ 227,000
County Bank Corp ("County") [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total	$ 672,762
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Loans	424,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits	$ 573,601
County Bank Corp ("County") [Member] | Common Stock [Member]
Stock Issued During Period, Shares, Acquisitions (in shares) | shares	3,603,872
Stock Issued During Period, Value, Acquisitions	$ 108,000
County Bank Corp ("County") [Member] | Fractional Stock [Member]
Stock Issued During Period, Shares, Acquisitions (in shares) | shares	299

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The amount of liability arising from total deposits.

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