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Note 11 - Stock Option Plans (Tables) | 12 Months Ended
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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 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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