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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Number of Operating Segments       2      
Retained Earnings (Accumulated Deficit), Ending Balance   $ 359,628   $ 359,628   $ 353,574  
Loans and Leases Receivable, Allowance, Impact of Accounting Policy Adoption     $ 0   $ 8,221    
Off-Balance Sheet, Credit Loss, Liability, Ending Balance $ 3,850           $ 350
Loans and Leases Receivable, Net Amount, Total   4,146,968   4,146,968   3,479,676  
Goodwill, Impairment Loss   $ 0 $ 0 $ 0 $ 0 $ 0  
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            
Accounting Standards Update 2016-13 [Member]              
Retained Earnings (Accumulated Deficit), Ending Balance 8,800            
Loans and Leases Receivable, Allowance, Impact of Accounting Policy Adoption 8,200            
Off-Balance Sheet, Credit Loss, Liability, Ending Balance 3,500            
Deferred Tax Assets, Net of Valuation Allowance, Total $ 2,900