Note 14 - Deferred Compensation Plans (Details Textual)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Officer [Member]
Deferred Compensation Liability, Current and Noncurrent, Total	$ 259,000	$ 296,000
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 15,000	17,000	$ 19,000
Director [Member]
Deferred Compensation Arrangement with Individual, Maximum Contractual Term	15 years
Deferred Compensation Liability, Current and Noncurrent, Total	$ 148,000	153,000
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 17,000	$ 18,000	$ 19,000
Peoples Bancorp, Inc [Member]
Number of Key Employees	3
Deferred Compensation Arrangement with Individual, Maximum Contractual Term	10 years