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Note 8 - Business Combination - Allocation of Purchase Price (Details) - USD ($) $ in Thousands | Jul. 01, 2020 | Oct. 01, 2019 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | ---
Goodwill, Ending Balance |  |  | $ 59,946 | $ 60,506 |
Community Shores Bank Corp ("Community Shores") [Member] |  |  |  |  |
Business Combination, Consideration Transferred, Total | $ 20,881 |  |  |  |
Cash and cash equivalents | 41,023 |  |  |  |
Securities available for sale | 20,023 |  |  |  |
Federal Home Loan Bank and Federal Reserve Bank stock | 300 |  |  |  |
Originated loans | 174,802 |  |  |  |
Premises and equipment | 6,204 |  |  |  |
Other real estate owned | 346 |  |  |  |
Deposit based intangible | 760 |  |  |  |
Other assets | 1,077 |  |  |  |
Total assets | 244,535 |  |  |  |
Non-interest bearing deposits | 65,499 |  |  |  |
Interest bearing deposits | 162,333 |  |  |  |
Total deposits | 227,832 |  |  |  |
Subordinated debentures | 3,039 |  |  |  |
Other liabilities | 136 |  |  |  |
Total liabilities | 231,007 |  |  |  |
Net assets acquired | 13,528 |  |  |  |
Goodwill, Ending Balance | 7,353 |  |  | $ 7,300 |
Consideration | $ 20,881 |  |  |  |
County Bank Corp ("County") [Member] |  |  |  |  |
Business Combination, Consideration Transferred, Total |  | $ 107,945 |  |  |
Cash and cash equivalents |  | 20,638 |  |  |
Securities available for sale |  | 474 |  |  |
Federal Home Loan Bank and Federal Reserve Bank stock |  | 2,915 |  |  |
Originated loans |  | 390,116 |  |  |
Premises and equipment |  | 9,271 |  |  |
Other real estate owned |  | 1,364 |  |  |
Deposit based intangible |  | 6,359 |  |  |
Other assets |  | 4,002 |  |  |
Total assets |  | 672,762 |  |  |
Non-interest bearing deposits |  | 124,113 |  |  |
Interest bearing deposits |  | 449,488 |  |  |
Total deposits |  | 573,601 |  |  |
Other liabilities |  | 3,282 |  |  |
Total liabilities |  | 603,683 |  |  |
Net assets acquired |  | 69,079 |  |  |
Goodwill, Ending Balance |  | 38,866 |  |  | $ 38,900
Consideration |  | 107,945 |  |  |
Securities available for sale |  | 187,230 |  |  |
Loans to other financial institutions |  | 33,481 |  |  |
Bank owned life insurance |  | 16,912 |  |  |
Federal funds purchased |  | 3,800 |  |  |
Advances from Federal Home Loan Bank |  | $ 23,000 |  |  |

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