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Note 11 - Share Option Plans (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

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

		Year ended December 31,
		201 7				201 6				201 5
Volatility			41.6	%			66.1	%			44.1	%
Risk-free interest rate			1.8	%			1.3	%			1.3	%
Expected life (in years)			4.55				4.3				4.0
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		$	20.08			$	11.18			$	7.40

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

		Year ended December 31,								Year ended December 31,								Year ended December 31,
		201 7								201 6								201 5
		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			474,501			$	12.67				513,366			$	9.24				976,062			$	5.41
Granted			370,025				54.10				81,750				22.66				67,500				21.26
Exercised			(172,759	)			7.88				(109,963	)			3.79				(517,998	)			3.53
Forfeited			(18,196	)			37.70				(9,902	)			16.80				(10,323	)			13.30
Expired			—				—				(750	)			3.76				(1,875	)			2.40
Outstanding, end of period			653,571				36.69				474,501				12.67				513,366				9.24
Options exercisable, end of period			243,771			$	14.79				332,192			$	10.08				321,155			$	6.49

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
$	2.92				-			$	8.92				91,133			$	6.63				1.6			$	5,779,404				91,133			$	6.63				1.6			$	5,779,404
$	10.16				-			$	19.95				120,913				16.30				3.5				6,499,346				92,638				15.87				3.3				5,018,978
$	21.10				-			$	27.53				81,000				23.65				4.2				3,758,393				55,000				24.61				3.8				2,499,313
$	35.25				-			$	37.35				14,375				35.89				5.4				491,062				5,000				35.25				6.0				174,000
$	43.15				-			$	47.00				18,500				44.19				6.1				478,400				—				—				—				—
$	53.20				-			$	55.65				327,650				55.41				6.4				4,795,160				—				—				—				—
													653,571			$	36.69				4.9			$	21,801,765				243,771			$	14.79				2.8			$	13,471,695

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

		Year ended December 31, 2017				Year ended December 31, 2016				Year ended December 31, 2015
Network expenses		$	109,988			$	21,704			$	28,915
Sales and marketing			571,682				236,063				188,035
Technical operations and development			360,415				98,059				111,239
General and administrative			414,487				443,608				197,836
		$	1,456,572			$	799,434			$	526,025

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