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Note 15 - Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

		2014				2013				2012

Stock option and incentive plans		$	832,845			$	734,827			$	798,929
Stock purchase plan			58,774				57,452				50,831
		$	891,619			$	792,279			$	849,760

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

		December 31,
		2014								2013								2012
						Weighted								Weighted								Weighted
						Average								Average								Average
						Exercise								Exercise								Exercise
		Shares				Price				Shares				Price				Shares				Price

Outstanding, beginning			662,506			$	13.82				608,852			$	13.27				535,130			$	13.85
Granted			82,609				17.11				96,232				15.68				102,722				9.30
Exercised			(23,659	)			10.22				(41,258	)			10.06				(17,876	)			9.68
Forfeited			(59,685	)			19.02				(1,320	)			10.53				(11,124	)			10.57
Outstanding, ending			661,771				13.89				662,506				13.82				608,852				13.27

Exercisable, ending			420,429								419,735								391,378

Weighted average fair value per option of options granted during the period		$	5.68							$	5.14							$	2.79

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

				Options Outstanding
								Weighted								Options Exercisable
								Average				Weighted								Weighted
								Remaining				Average								Average
Range of				Number				Contractual				Exercise				Number				Exercise
Exercise Prices				Outstanding				Life				Price				Exercisable				Price

$7.72	to	$8.93			51,990				5.89			$	8.13				29,140			$	8.19
$9.00	to	$10.24			198,499				5.82				9.22				131,420				9.21
$13.25	to	$16.85			237,893				4.92				15.85				169,514				15.94
$17.00	to	$18.60			114,424				7.05				17.33				31,390				17.86
$19.05	to	$20.63			30,265				1.04				19.10				30,265				19.10
$21.00	to	$22.00			28,700				0.16				21.28				28,700				21.28
					661,771												420,429

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]

		2014				2013				2012

Shares granted			24,811				27,415				29,671
Shares purchased			25,321				27,110				31,554
Weighted average fair value per share granted		$	2.37			$	2.10			$	1.71

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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