Note 16 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

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

			Fair Value Measurements at December 31, 2015 Using
Description	Balance as of December 31, 2015		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	$	212,464	$	---	$	212,464	$	---
States and political subdivisions		16,475		---		16,475		---
Mortgage-backed securities		1,319		---		1,319		---
Corporate debt securities		5,746		---		5,746		---
Other securities		127		---		127		---
Total securities available for sale	$	236,131	$	---	$	236,131	$	---

			Fair Value Measurements at December 31, 2014 Using
Description	Balance as of December 31, 2014		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	$	194,219	$	---	$	194,219	$	---
States and political subdivisions		19,380		---		19,380		---
Mortgage-backed securities		2,014		---		2,014		---
Corporate debt securities		7,104		---		7,104		---
Other securities		127		---		127		---
Total securities available for sale	$	222,844	$	---	$	222,844	$	---

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, 2015	Impaired loans net of valuation allowance	$	2,328	$	---	$	---	$	2,328
December 31, 2014	Impaired loans net of valuation allowance		7,224		---		---		7,224

				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, 2015	Other real estate owned net of valuation allowance	$	4,165	$	---	$	---	$	4,165
December 31, 2014	Other real estate owned net of valuation allowance		4,744		---		---		4,744

Fair Value Inputs, Assets, Quantitative Information [Table Text Block]

	Valuation Technique	Unobservable Input	Range (Weighted Average)
Impaired loans	Present value of cash flows	Discount rate	6.00%	-	7.38%	(6.56%)

	Valuation Technique	Unobservable Input	Range (Weighted Average)
Impaired loans	Discounted appraised value	Selling cost(1)		10%
Impaired loans	Present value of cash flows	Discount rate	5.88%	-	9.50%	(6.15%)

	Valuation Technique	Unobservable Input	Range (Weighted Average)
Other real estate owned	Discounted appraised value	Selling cost	0%	-	10.00%	(5.89%)
Other real estate owned	Discounted appraised value	Discount for lack of marketability and age of appraisal	0%	-	50.01%	(10.16%)

	Valuation Technique	Unobservable Input	Range (Weighted Average)
Other real estate owned	Discounted appraised value	Selling cost	0%	-	11%	(8.60%)
Other real estate owned	Discounted appraised value	Discount for lack of marketability and age of appraisal	0%	-	48.77%	(20.81%)

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

	December 31, 2015
			Estimated Fair Value
	Carrying Amount		Level 1		Level 2		Level 3
Financial assets:
Cash and due from banks	$	12,152	$	12,152	$	---	$	---
Interest-bearing deposits		130,811		130,811		---		---
Securities		388,159		---		394,163		---
Restricted securities		1,129		---		1,129		---
Mortgage loans held for sale		634		---		634		---
Loans, net		610,711		---		---		621,590
Accrued interest receivable		5,769		---		5,769		---
Bank-owned life insurance		22,401		---		22,401		---
Financial liabilities:
Deposits	$	1,018,859	$	---	$	826,476	$	193,912
Accrued interest payable		56		---		56		---

	December 31, 2014
			Estimated Fair Value
	Carrying Amount		Level 1		Level 2		Level 3
Financial assets:
Cash and due from banks	$	12,894	$	12,894	$	---	$	---
Interest-bearing deposits		102,548		102,548		---		---
Securities		384,296		---		390,547		---
Restricted securities		1,089		---		1,089		---
Mortgage loans held for sale		291		---		291		---
Loans, net		597,203		---		---		633,063
Accrued interest receivable		5,748		---		5,748		---
Bank-owned life insurance		21,797		---		21,797		---
Financial liabilities:
Deposits	$	982,428	$	---	$	765,682	$	216,469
Accrued interest payable		68		---		68		---