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Note 11 - Stock Option Plans (Tables)

12 Months Ended

Dec. 31, 2014

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,
		2014				2013				2012
Volatility			56.1	%			69.4	%			52.1	%
Risk-free interest rate			1.3	%			1.1	%			0.5	%
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		$	7.02			$	4.52			$	2.24

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

		Year ended December 31, 2014								Year ended December 31, 2013								Year ended December 31, 2012
		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			1,407,639			$	3.80				2,148,170			$	2.56				2,186,511			$	2.28
Granted			102,475				15.78				180,375				8.36				194,750				5.44
Exercised			(502,061	)			2.95				(890,034	)			1.80				(191,585	)			2.20
Forfeited			(28,366	)			6.60				(29,684	)			4.88				(40,751	)			3.20
Expired			(3,625	)			3.36				(1,188	)			1.44				(755	)			1.76
Outstanding, end of year			976,062			$	5.41				1,407,639			$	3.80				2,148,170			$	2.56
Options exercisable, end of year			725,392			$	4.03				1,045,475			$	3.14				1,772,723			$	2.28

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				Aggregate intrinsic value
$	2.40	-	$	2.40				113,250			$	2.40				0.4			$	1,926,383				113,250			$	2.40			$	1,926,383
$	2.48	-	$	2.80				318,451			$	2.76				2.1				5,301,971				318,451			$	2.76				5,301,971
$	2.92	-	$	3.76				136,973			$	3.01				2.9				2,246,604				112,866			$	3.03				1,849,080
$	4.20	-	$	15.93				407,388			$	9.13				4.9				4,188,903				180,825			$	7.91				2,078,742
								976,062			$	5.41							$	13,663,861				725,392			$	4.03			$	11,156,176

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

		Year ended December 31, 2014				Year ended December 31, 2013				Year ended December 31, 2012
Network expenses		$	30,938			$	31,664			$	24,480
Sales and marketing			143,514				129,302				92,168
Technical operations and development			85,904				78,800				59,141
General and administrative			282,382				191,137				184,910
		$	542,738			$	430,903			$	360,699

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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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