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Note 14 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

		Year Ended December 31,
		2023				2022				2021
		(Dollars in thousands)
Cost of revenues		$	6,899			$	6,382			$	4,656
Selling and marketing expenses			866				1,230				766
Research and development expenses			94				—				—
General and administrative expenses			7,620				4,034				3,746
Total stock-based compensation expense			15,479				11,646				9,168
Tax effect on stock-based compensation expense			1,598				1,270				872
Net effect of stock-based compensation expense		$	13,881			$	10,376			$	8,296

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		Year Ended December 31,
		2023				2022				2021
For stock based awards issued by the Company:
Risk-free interest rates			4.2	%			1.7	%			0.7	%
Expected lives (in weighted average years)			2.5				5.3				3.8
Dividend yield			0.6	%			0.7	%			0.6	%
Expected volatility (weighted average)			38.2	%			34.6	%			36.7	%

		Year Ended December 31,
		2023				2022				2021
Weighted average forfeiture rate			8.0	%			10.2	%			6.1	%

Risk-free interest rates	3.86%	—	4.68%
Expected life (in years)	2	—	5.75
Dividend yield	0.59%
Expected volatility (weighted average)	36.0%	—	42.2%

Risk-free interest rates			4.70%
Expected life (in years)			1%
Dividend yield			0.56%
Expected volatility (weighted average)			34.80%

Risk-free interest rates	4.13%	—	(4.38)%
Expected life (in years)	2	—	3
Dividend yield	0.56%
Expected volatility (weighted average)	43.17%	—	40.57%

Risk-free interest rates	1.31%	—	1.62%
Expected life (in years)	2	—	6
Dividend yield	0.67%
Expected volatility (weighted average)	32.85%	—	46.07%

Risk-free interest rates		0.14%	—	(0.16)%
Expected life (in years)			1
Dividend yield			0.65%
Expected volatility (weighted average)			43.26%

Share-Based Payment Arrangement, Option and Stock Appreciation Rights, Activity [Table Text Block]

		Year Ended December 31,
		2023								2022								2021
		Awards (In thousands)				Weighted Average Exercise Price				Awards (In thousands)				Weighted Average Exercise Price				Awards (In thousands)				Weighted Average Exercise Price
Outstanding at beginning of year			1,810			$	60.08				2,025			$	58.70				2,240			$	57.68
Granted:
SARs ⁽¹⁾			—				—				513				71.15				15				77.22
RSUs ⁽²⁾			189				—				109				—				12				—
PSUs ⁽³⁾			35				—				20				—				—				—
Exercised			(492	)			56.00				(728	)			52.73				(159	)			40.47
Forfeited			(59	)			54.09				(129	)			62.27				(83	)			64.34
Expired			—				—				—				—				—				—
Outstanding at end of year			1,483				52.57				1,810				60.08				2,025				58.70
Options and SARs exercisable at end of year			606				66.81				749				58.30				881				53.20
Weighted-average fair value of awards granted during the year						$	79.98							$	33.02							$	46.23

Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

					Awards Outstanding												Awards 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

	$	—				345				1.6			$	26,127											$	—
		51.71				8				1.0				193				8				1.0				193
		53.16				3				0.9				73				3				0.9				73
		53.44				78				0.5				1,736				78				0.5				1,736
		57.97				8				0.6				134				8				0.6				134
		63.40				45				2.5				562				34				2.5				422
		67.54				7				2.9				54				7				2.9				54
		68.34				47				2.4				349				35				2.4				261
		69.14				470				2.4				3,128				316				2.4				2,101
		71.15				448				4.2				2,077				101				4.2				468
		71.71				4				1.6				16				4				1.6				16
		76.43				5				1.9				—				5				1.9				—
		76.54				9				3.9				—				4				3.9				—
		78.53				6				3.3				—				3				3.3				—
		90.28				1				3.0				—				—				3.0				—
						1,483				2.6			$	34,449				606				2.4			$	5,458

					Awards Outstanding												Awards 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

	$	—				157				2.1			$	13,536				—				—			$	—
		51.71				8				2.0				278				6				2.0				209
		53.16				3				1.9				108				3				1.9				108
		53.44				103				1.5				3,405				103				1.5				3,405
		55.16				295				0.9				9,236				295				0.9				9,236
		57.97				8				1.6				214				8				1.6				214
		63.35				74				0.9				1,719				74				0.9				1,719
		63.40				45				3.5				1,047				23				3.5				524
		67.54				7				3.9				125				7				3.9				125
		68.34				47				3.4				849				23				3.4				424
		69.14				539				3.4				9,357				199				3.4				3,456
		71.15				499				5.2				7,644				—				5.2				—
		71.71				4				2.6				59				3				2.6				44
		76.43				5				2.9				49				5				2.9				49
		76.54				9				4.9				85				—				4.9				—
		78.53				6				4.3				51				—				4.3				—
		90.28				1				4.0				—				—				4				—
						1,810				3.1			$	47,762				749				1.8			$	19,513