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Note 4 - Premises and Equipment, Net - Summary of Premises and Equipment (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Property, plant and equipment, gross $ 78,903,000 $ 76,623,000
Less: accumulated depreciation 31,801,000 30,589,000
Premises and equipment, net 47,102,000 46,034,000
Land and Land Improvements [Member]    
Property, plant and equipment, gross 17,939,000 18,046,000
Building [Member]    
Property, plant and equipment, gross 43,044,000 41,179,000
Furniture and Fixtures [Member]    
Property, plant and equipment, gross $ 17,920,000 $ 17,398,000