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Note 1 - Basis of Presentation (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Goodwill, Impairment Loss	$ 1,490		$ 1,492
Number of Operating Segments			1
Accounting Standards Update 2017-07 [Member] | Reclassification of Non-service Components of Net Period Benefit Costs From Salaries and Employee Benefits to Other Expense [Member] | Three Months Ended September 30, 2017 [Member]
Prior Period Reclassification Adjustment		$ 136
Accounting Standards Update 2017-07 [Member] | Reclassification of Non-service Components of Net Period Benefit Costs From Salaries and Employee Benefits to Other Expense [Member] | Nine Months Ended September 30, 2017 [Member]
Prior Period Reclassification Adjustment		407
Accounting Standards Update 2016-15 [Member] | Reclassification of Proceeds from Bank Owned Life Insurance from Operating Activities to Investing Activities [Member] | Nine Months Ended September 30, 2017 [Member]
Prior Period Reclassification Adjustment		$ 2,640
Accounting Standards Update 2014-09 [Member] | Reclassification of Interchange Expense From Noninterest Expense to Net Against Interchange Income [Member] | Three Months Ended September 30, 2017 [Member]
Prior Period Reclassification Adjustment			$ 432
Accounting Standards Update 2014-09 [Member] | Reclassification of Interchange Expense From Noninterest Expense to Net Against Interchange Income [Member] | Nine Months Ended September 30, 2017 [Member]
Prior Period Reclassification Adjustment			$ 1,230

X

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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