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Note 15 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

	Year Ended December 31,
	2017		2016		2015
	(Dollars in thousands, except per share data)
Cost of revenues	$	3,369	$	2,400	$	1,753
Selling and marketing expenses		452		247		123
General and administrative expenses		4,939		2,510		2,079
Total stock-based compensation expense		8,760		5,157		3,955
Tax effect on stock-based compensation expense		604		617		440
Net effect of stock-based compensation expense	$	8,156	$	4,540	$	3,515

	Year Ended December 31,
	2017			2016			2015
For stock options issued by the Company:
Risk-free interest rates		1.9	%		1.3	%		1.4	%
Expected lives (in weighted average years)		3.1			4.5			4.0
Dividend yield		0.62	%		1.10	%		0.70	%
Expected volatility (weighted average)		27.2	%		30.7	%		29.2	%
Forfeiture rate (weighted average)		0.0	%		8.4	%		0.0	%

	Year Ended December 31,
	2017					2016					2015
	Shares (In thousands)			Weighted Average Exercise Price		Shares (In thousands)			Weighted Average Exercise Price		Shares (In thousands)			Weighted Average Exercise Price
Outstanding at beginning of year		2,565		$	33.36		2,438		$	25.38		4,477		$	27.48
Granted, at fair value:
Stock Options		30			57.97		1,155			43.01		45			38.24
SARs*		132			62.55		—			—		—			—
RSUs**		23			—
Exercised		(1,181	)		25.92		(967	)		25.33		(1,589	)		26.77
Forfeited		(21	)		46.15		(57	)		24.12		(125	)		27.33
Expired		—			—		(4	)		26.84		(370	)		45.78
Outstanding at end of year		1,548			41.35		2,565			33.36		2,438			25.38
Options and SARs exercisable at end of year		431			32.61		557			25.22		858			26.75
Weighted-average fair value of options and SARs granted during the year				$	22.82				$	11.61				$	8.68

		Options Outstanding						Options Exercisable
Exercise Price		Number of Stock-based Awards Outstanding		Weighted Average Remaining Contractual Life in Years		Aggregate Intrinsic Value		Number of Stock-based Awards Exercisable		Weighted Average Remaining Contractual Life in Years		Aggregate Intrinsic Value

$	-		23		3.9		1,455		-		-		-
	20.13		35		1.3		1,533		35		1.3		1,533
	23.34		176		1.4		7,150		176		1.4		7,150
	25.65		10		0.3		398		10		0.3		398
	35.15		15		5.1		432		15		5.1		432
	38.24		15		4.8		386		15		4.8		386
	42.87		1,074		4.5		22,651		143		4.5		3,005
	47.46		38		5.9		619		38		5.9		619
	57.97		30		6.6		180		-		-		-
	58.79		23		4.5		120		-		-		-
	63.35		109		5.9		66		-		-		-

			1,548		4.2	$	34,990		432		3.0	$	13,523

		Options Outstanding						Options Exercisable
Exercise Price		Number of Stock-based Awards Outstanding		Weighted Average Remaining Contractual Life in Years		Aggregate Intrinsic Value		Number of Stock-based Awards Exercisable		Weighted Average Remaining Contractual Life in Years		Aggregate Intrinsic Value

$	18.56		15		2.8		526		15		2.8		526
	19.69		15		2.6		509		15		2.6		509
	20.13		108		2.3		3,608		108		2.3		3,608
	20.54		53		2.3		1,761		28		2.3		934
	23.34		635		2.4		19,226		140		2.4		4,247
	24.57		9		2.1		269		1		2.1		33
	25.65		68		1.3		1,905		68		1.3		1,905
	26.70		15		3.8		404		15		3.8		404
	28.23		30		4.8		762		30		4.8		762
	29.52		400		3.6		9,640		75		3.6		1,807
	29.95		17		0.3		400		17		0.3		400
	35.15		15		6.1		277		-		-		-
	38.24		45		5.8		692		45		5.8		692
	42.87		1,080		5.5		11,610		-		-		-
	47.46		60		6.9		370		-		-		-


			2,565		4.1	$	51,959		557		2.7	$	15,827

	Grant of options to purchase 100,000 shares of common stock			Grant of options to purchase 300,000 shares of common stock
Risk-free interest rates		2.36	%		1.64	%
Expected life (in years)		7.25			4.75
Dividend yield		0.90	%		0.90	%
Expected volatility		42.80	%		33.10	%