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Note 14 - Deferred Compensation Plans (Details Textual)
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Officer [Member]      
Deferred Compensation Liability, Current and Noncurrent, Total $ 296,000 $ 332,000  
Deferred Compensation Arrangement with Individual, Compensation Expense $ 17,000 19,000 $ 21,000
Director [Member]      
Deferred Compensation Arrangement with Individual, Maximum Contractual Term 15 years    
Deferred Compensation Liability, Current and Noncurrent, Total $ 153,000 157,000  
Deferred Compensation Arrangement with Individual, Compensation Expense $ 18,000 $ 19,000  
Peoples Bancorp, Inc [Member]      
Number of Key Employees 3    
Deferred Compensation Arrangement with Individual, Maximum Contractual Term 10 years