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Note 6 - Goodwill and Acquired Intangible Assets (Details Textual) - USD ($)
 12 Months Ended
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2006
Goodwill, Ending Balance   $ 59,946,000 $ 59,946,000 $ 60,506,000    
Amortization of Intangible Assets   $ 1,153,000 1,307,000 1,498,000    
Core Deposits [Member]            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Month)   120 months        
Amortization of Intangible Assets   $ 1,153,000 $ 1,307,000      
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    
Goodwill, Impairment Loss $ 0          
Community Shores Bank Corporation [Member] | Core Deposits [Member]            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Month)   8 years