Note 15 - Deferred Compensation (Details Textual)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Peoples Bancorp, Inc [Member]
Deferred Compensation Arrangement with Individual, Maximum Contractual Term	10 years
Number of Key Employees	3
Officer [Member]
Deferred Compensation Arrangement with Individual, Maximum Contractual Term	15 years
Deferred Compensation Liability, Current and Noncurrent	$ 365,000	$ 370,000
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 21,000	8,000
Director [Member]
Deferred Compensation Arrangement with Individual, Maximum Contractual Term	15 years
Deferred Compensation Liability, Current and Noncurrent	$ 161,000	164,000
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 19,000	$ 19,000