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Note 11 - Stock Option Plans (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

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

		Year ended December 31,
		201 6				201 5				201 4
Volatility			66.1	%			44.1	%			56.1	%
Risk-free interest rate			1.3	%			1.3	%			1.3	%
Expected life (in years)			4.3				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		$	11.18			$	7.40			$	7.02

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

		Year ended December 31,								Year ended December 31,								Year ended December 31,
		2016								2015								2014
		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			513,366			$	9.24				976,062			$	5.41				1,407,639			$	3.80
Granted			81,750				22.66				67,500				21.26				102,475				15.78
Exercised			(109,963	)			3.79				(517,998	)			3.53				(502,061	)			2.95
Forfeited			(9,902	)			16.80				(10,323	)			13.30				(28,366	)			6.60
Expired			(750	)			3.76				(1,875	)			2.40				(3,625	)			3.36
Outstanding, end of period			474,501				12.67				513,366				9.24				976,062				5.41
Options exercisable, end of period			332,192			$	10.08				321,155			$	6.49				725,392			$	4.03

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	-	$ 4.48			51,771			$	2.95					1.2			$	1,671,976				51,771			$	2.95					1.2			$	1,671,976
$ 5.52	-	$ 8.92			171,705				6.64					2.4				4,912,868				157,723				6.47					2.3				4,539,689
$ 10.16	-	$14.67			29,375				10.83					3.7				717,287				19,998				11.15					3.6				482,018
$ 15.51	-	$19.95			131,150				17.37					4.6				2,344,893				72,700				17.18					4.3				1,314,039
$ 21.10	-	$24.96			71,750				22.36					5.4				924,728				30,000				23.51					4.5				352,125
$ 24.97	-	$27.53			18,750				27.53					4.7				144,750				-				-					-				-
					474,501			$	12.67					3.5			$	10,716,502				332,192			$	10.08					2.9			$	8,359,847

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

		Year ended December 31, 201 6				Year ended December 31, 201 5				Year ended December 31, 201 4
Network expenses		$	21,704			$	28,915			$	30,938
Sales and marketing			236,063				188,035				143,514
Technical operations and development			98,059				111,239				85,904
General and administrative			443,608				197,836				282,382
		$	799,434			$	526,025			$	542,738

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- Definition

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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