Note 15 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

			Fair Value Measurements at December 31, 2018 Using
Description	Balance as of December 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
U.S. Government agencies and corporations	$	300,047	$	---	$	300,047	$	---
States and political subdivisions		118,616		---		118,616		---
Mortgage-backed securities		628		---		628		---
Corporate debt securities		5,719		---		5,719		---
Total securities available for sale	$	425,010	$	---	$	425,010	$	---

			Fair Value Measurements at December 31, 2017 Using
Description	Balance as of December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
U.S. Government agencies and corporations	$	307,719	$	---	$	307,719	$	---
States and political subdivisions		16,834		---		16,834		---
Mortgage-backed securities		659		---		659		---
Corporate debt securities		6,175		---		6,175		---
Total securities available for sale	$	331,387	$	---	$	331,387	$	---

Fair Value Measurements, Nonrecurring [Table Text Block]

				Carrying value
Date	Description	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	Assets:
December 31, 2018	Impaired loans net of valuation allowance	$	1,014	$	---	$	---	$	1,014
December 31, 2017	Impaired loans net of valuation allowance		1,303		---		---		1,303

				Carrying Value
Date	Description	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	Assets:
December 31, 2018	Other real estate owned net of valuation allowance	$	2,052	$	---	$	---	$	2,052
December 31, 2017	Other real estate owned net of valuation allowance		2,817		---		---		2,817

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

Impaired Loans	Valuation Technique	Unobservable Input	Range (Weighted Average)
December 31, 2018	Present value of cash flows	Discount rate	5.50%	-	7.25%	(6.05%)
December 31, 2017	Present value of cash flows	Discount rate	5.50%	-	13.25%	(5.92%)

	Valuation Technique	Unobservable Input	Range (Weighted Average)
Other real estate owned	Discounted appraised value	Selling cost	0.00% (1)	–	6.00%	(0.12%)
Other real estate owned	Discounted appraised value	Discount for lack of marketability and age of appraisal	0.00%	-	50.05%	(1.45%)

	Valuation Technique	Unobservable Input	Range (Weighted Average)
Other real estate owned	Discounted appraised value	Selling cost	2.00% (1)	–	6.01%	(4.72%)
Other real estate owned	Discounted appraised value	Discount for lack of marketability and age of appraisal	1.68%	-	68.33%	(11.07%)

Fair Value, by Balance Sheet Grouping [Table Text Block]

	December 31, 2018
			Estimated Fair Value
	Carrying Amount		Level 1		Level 2		Level 3
Financial assets:
Cash and due from banks	$	12,882	$	12,882	$	---	$	---
Interest-bearing deposits		43,491		43,491		---		---
Securities		425,010		---		425,010		---
Restricted securities		1,220		---		1,220		---
Mortgage loans held for sale		72		---		72		---
Loans, net		702,409		---		---		684,565
Accrued interest receivable		5,160		---		5,160		---
Bank-owned life insurance		34,657		---		34,657		---
Financial liabilities:
Deposits	$	1,051,942	$	---	$	950,143	$	101,749
Accrued interest payable		89		---		89		---

	December 31, 2017
			Estimated Fair Value
	Carrying Amount		Level		Level 2		Level 3
Financial assets:
Cash and due from banks	$	12,926	$	12,926	$	---	$	---
Interest-bearing deposits		51,233		51,233		---		---
Securities		458,551		---		461,500		---
Restricted securities		1,200		---		1,200		---
Mortgage loans held for sale		260		---		260		---
Loans, net		660,144		---		---		656,399
Accrued interest receivable		5,297		---		5,297		---
Bank-owned life insurance		33,756		---		33,756		---
Financial liabilities:
Deposits	$	1,059,734	$	---	$	944,850	$	113,053
Accrued interest payable		62		---		62		---