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Note 4 - Premises and Equipment, Net (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Depreciation, Total $ 6,000,000.0 $ 5,800,000 $ 5,200,000
Operating Lease, Weighted Average Remaining Lease Term (Year) 2 years 6 months    
Operating Lease, Weighted Average Discount Rate, Percent 5.47%    
Operating Lease, Expense $ 1,300,000 1,200,000 $ 1,400,000
Premises and Equipment, Net [Member]      
Operating Lease, Right-of-Use Asset 3,500,000 2,900,000  
Other Liabilities [Member]      
Operating Lease, Liability, Total $ 3,515,000 $ 2,800,000  
Minimum [Member]      
Lessee, Operating Lease, Renewal Term (Year) 3 years    
Maximum [Member]      
Lessee, Operating Lease, Renewal Term (Year) 5 years