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Note 21 - Business Combination (Details Textual)
 6 Months Ended 12 Months Ended
Jul. 01, 2020
USD ($)
shares
Oct. 01, 2019
USD ($)
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Goodwill, Ending Balance     $ 60,506,000 $ 60,506,000 $ 52,870,000   $ 13,728,000
Stock Issued During Period, Value, Acquisitions       15,494,000 $ 107,639,000    
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 $ 243,975,000            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Loans 174,000,000.0            
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 524,055            
Payments to Acquire Businesses, Gross $ 5,390,000            
Business Combination, Consideration Transferred, Total 20,881,000            
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual     3,200,000 1,041,000      
Goodwill, Ending Balance 7,913,000   $ 7,900,000 $ 7,900,000      
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Deposit Based Intangible $ 760,000            
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          
Goodwill, Ending Balance   38,866,000       $ 39,100,000  
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Deposit Based Intangible   6,359,000          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Originated Loans   200,000          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liabilities   500,000          
Goodwill, Purchase Accounting Adjustments   300,000          
Business Acquisition, Transaction Costs   2,400,000          
Noncash Merger Related Costs   2,100,000          
Business Combination, Netted With Stock Issuance Costs   $ 297,000          
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