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Note 1 - Summary of Significant Accounting Policies (Details Textual)
1 Months Ended 12 Months Ended
Jan. 01, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
May 01, 2019
Repayments of Subordinated Debt, Total     $ (0) $ 3,609,000 $ (0)  
Number of Operating Segments     2      
Loans and Leases Receivable, Net Amount, Total     $ 3,479,676,000 2,818,225,000    
Retained Earnings (Accumulated Deficit), Ending Balance     353,574,000 333,699,000    
Loans and Leases Receivable, Allowance, Impact of Accounting Policy Adoption $ 8,200,000   8,221,000      
Off-Balance Sheet, Credit Loss, Liability, Ending Balance 3,850,000   $ 3,900,000 $ 350,000    
Accounting Standards Update 2016-13 [Member]            
Retained Earnings (Accumulated Deficit), Ending Balance 8,800,000          
Loans and Leases Receivable, Allowance, Impact of Accounting Policy Adoption 8,200,000          
Off-Balance Sheet, Credit Loss, Liability, Ending Balance 3,500,000          
Deferred Tax Assets, Net of Valuation Allowance, Total 2,900,000          
Minimum [Member]            
Property, Plant and Equipment, Useful Life (Year)     3 years      
Maximum [Member]            
Property, Plant and Equipment, Useful Life (Year)     40 years      
Transfer of Loans From Purchased Credit Impaired to Purchased Credit Deteriorated [Member]            
Loans and Leases Receivable, Net Amount, Total $ 1,600,000          
Subordinated Notes Assumed in the king Acquisition [Member]            
Repayments of Subordinated Debt, Total   $ 4,000,000        
KBST [Member]            
Noncontrolling Interest, Ownership Percentage by Parent           100.00%