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Note 21 - Business Combinations (Details Textual)
 12 Months Ended
Jul. 01, 2020
USD ($)
shares
Oct. 01, 2019
USD ($)
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
County Bank Corp ("County") [Member]        
Number of Branch Offices   14    
Number of Loan Office   1    
Community Shores Bank Corp ("Community Shores") [Member]        
Number of Branch Offices 4      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total $ 244,535,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Loans 174,800,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits $ 227,832,000      
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares 524,139      
Payments to Acquire Businesses, Gross $ 5,390,000      
Business Combination, Consideration Transferred, Total $ 20,881,000      
Business Combination, Provisional Information Initial Accounting Incomplete Adjustment, Loans     $ 828,000  
Business Combination, Provisional Information Initial Accounting Incomplete Adjustment, Other Assets     (268,000)  
Goodwill, Purchase Accounting Adjustments     $ (560,000)  
County Bank Corp ("County") [Member]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total   $ 672,762,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Loans   424,000,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits   573,601,000    
Business Combination, Consideration Transferred, Total   $ 107,945,000    
Business Combination, Provisional Information Initial Accounting Incomplete Adjustment, Loans       $ (238,000)
Goodwill, Purchase Accounting Adjustments       (276,000)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liabilities       $ (502,000)
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   $ 108,000,000