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Note 13 - Stock Option Plans (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

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

		Year ended December 31,
		2018				2017				2016
Volatility			37.9	%			41.6	%			66.1	%
Risk-free interest rate			2.7	%			1.8	%			1.3	%
Expected life (in years)			4.48				4.55				4.3
Dividend yield			—	%			—	%			—	%
The weighted average grant date fair value for options issued, with the exercise price equal to market value on the date of grant		$	22.22			$	20.08			$	11.18

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

		Year ended December 31,								Year ended December 31,								Year ended December 31,
		2018								2017								2016
		Number of shares				Weighted average exercise price per share				Number of shares				Weighted average exercise price per share				Number of shares				Weighted average exercise price per share
Outstanding, beginning of period			653,571			$	36.69				474,501			$	12.67				513,366			$	9.24
Granted			163,366				62.80				370,025				54.10				81,750				22.66
Exercised			(63,886	)			12.86				(172,759	)			7.88				(109,963	)			3.79
Forfeited			(50,714	)			52.33				(18,196	)			37.70				(9,902	)			16.80
Expired			—				—				—				—				(750	)			3.76
Outstanding, end of period			702,337				43.80				653,571				36.69				474,501				12.67
Options exercisable, end of period			326,937			$	28.91				243,771			$	14.79				332,192			$	10.08

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

									Options outstanding																Options exercisable
Exercise price									Number outstanding				Weighted average exercise price per share				Weighted average remaining contractual life (years)				Aggregate intrinsic value				Number exercisable				Weighted average exercise price per share				Weighted average remaining contractual life (years)				Aggregate intrinsic value
$	5.52		-		$	8.56				58,135			$	6.92				0.9			$	3,089				58,135			$	6.92				0.9			$	3,090
$	10.16		-		$	19.95				99,588				16.44				2.5				4,344				97,088				16.35				2.5				4,244
$	21.10		-		$	27.53				65,000				23.47				3.2				2,378				55,000				23.91				3.0				1,988
$	35.25		-		$	37.35				14,375				35.89				4.4				347				10,625				36.11				4.2				254
$	43.15		-		$	47.00				18,500				44.19				5.1				294				8,000				43.75				5.1				131
$	53.20		-		$	58.65				328,387				55.67				5.4				1,443				98,089				55.21				5.1				476
$	64.10		-		$	64.10				118,352				64.10				6.4				—				—				—				—				—
										702,337			$	43.80				4.6			$	11,895				326,937			$	28.91				3.2			$	10,183

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

		Year ended December 31, 2018				Year ended December 31, 2017				Year ended December 31, 2016
Network expenses		$	223			$	110			$	22
Sales and marketing			1,025				573				236
Technical operations and development			636				360				98
General and administrative			690				414				443
		$	2,574			$	1,457			$	799

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