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Note 12 - Stock Option Plans (Tables)

12 Months Ended

Dec. 31, 2015

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

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

		Year ended December 31,
		2015				2014				2013
Volatility			44.1	%			56.1	%			69.4	%
Risk-free interest rate			1.3	%			1.3	%			1.1	%
Expected life (in years)			4.0	%			4.0	%			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		$	7.40			$	7.02			$	4.52

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

		Year ended								Year ended								Year ended
		December 31, 2015								December 31, 2014								December 31, 2013
		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 year			976,062			$	5.41				1,407,639			$	3.80				2,148,170			$	2.56
Granted			67,500				21.26				102,475				15.78				180,375				8.36
Exercised			(517,998	)			3.53				(502,061	)			2.95				(890,034	)			1.80
Forfeited			(10,323	)			13.30				(28,366	)			6.60				(29,684	)			4.88
Expired			(1,875	)			2.40				(3,625	)			3.36				(1,188	)			1.44
Outstanding, end of year			513,366				9.24				976,062				5.41				1,407,639				3.80
Options exercisable, end of year			321,155			$	6.49				725,392			$	4.03				1,045,475			$	3.14

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
$ 2.80	-	$ 2.92				118,490			$	2.84				1.8			$	2,163,787				118,490			$	2.84				1.8			$	2,163,787
$ 3.00	-	$ 5.76				148,348				5.18				2.8				2,361,720				110,841				5.08				2.5				1,775,898
$ 8.56	-	$10.16				92,253				9.05				4.2				1,111,453				43,374				8.92				3.9				528,510
$ 14.67	-	$24.96				154,275				18.18				5.3				538,064				48,450				16.46				4.8				224,724
						513,366			$	9.24				3.6			$	6,175,024				321,155			$	6.49				2.8			$	4,692,919

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

		Year ended December 31, 2015				Year ended December 31, 2014				Year ended December 31, 2013
Network expenses		$	28,915			$	30,938			$	31,664
Sales and marketing			188,035				143,514				129,302
Technical operations and development			111,239				85,904				78,800
General and administrative			197,836				282,382				191,137
		$	526,025			$	542,738			$	430,903

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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