Note 13 - Stock Option Plan (Tables)

12 Months Ended

Dec. 31, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Option Activity

	Number of options			Weighted average exercise price		Weighted average remaining contractual term (in years)		Aggregate intrinsic value
Outstanding at December 31, 2013		115,800		$	23.51
Exercised		(20,050	)		17.82
Forfeited		(27,375	)		29.66
Granted		20,000			25.16
Outstanding at December 31, 2014		88,375		$	23.27
Exercised		(13,750	)		18.11
Forfeited		(12,750	)		31.80
Granted		21,000			29.25
Outstanding at December 31, 2015		82,875			24.33
Exercised		(22,700	)		20.90
Forfeited		(9,725	)		25.60
Granted		23,500			30.40
Outstanding at December 31, 2016		73,950		$	27.14		2.62	$	640
Exercisable at December 31, 2016		18,825		$	22.52		0.69	$	250

Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable

	Options outstanding		Exercise price		Remaining life (in years)		Options exercisable		Exercise price
		6,950	$	21.35		0.07		6,950	$	21.35
		11,875		23.20		1.06		11,875		23.20
		13,775		25.16		2.08		—		—
		17,850		29.25		3.08		—		—
		23,500		30.40		4.13		—		—
Outstanding at December 31, 2016		73,950	$	27.14		2.62		18,825	$	22.52

Schedule of Tax Benefits and Intrinsic Value Related to Exercised Stock Options

	2016		2015		2014
Tax benefits related to stock options exercised	$	17	$	21	$	29
Intrinsic value of stock options exercised		234		148		161