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Note 8 - Stockholders' Equity (Deficiency) - Outstanding Options Granted to Consultants for Sales and Pre-marketing Services (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Granted (in dollars per share) | $ 16.87 | $ 28.253 | $ 25.077
Options exercisable at the end of the year (in shares) | 1,752,416 | 1,794,249 | 2,620,454
Exercise price per share (in dollars per share) | $ 16.87 | $ 28.253 | $ 25.077
Consultants [Member] |  |  |
Options for shares of common stock (in shares) | 44,384 | 49,430 |
Options exercisable at the end of the year (in shares) | 23,000 | 18,991 |
February 2013 [Member] | Consultants [Member] |  |  |
Options for shares of common stock (in shares) | 1,500 | 3,000 |
Granted (in dollars per share) | $ 12.47 | $ 12.47 |
Options exercisable at the end of the year (in shares) | 1,344 | 2,125 |
Exercisable through | February 2023 | February 2023 |
Exercise price per share (in dollars per share) | $ 12.47 | $ 12.47 |
August 2013 [Member] | Consultants [Member] |  |  |
Options for shares of common stock (in shares) | 4,188 | 5,000 |
Granted (in dollars per share) | $ 21.14 | $ 21.14 |
Options exercisable at the end of the year (in shares) | 3,104 | 2,917 |
Exercisable through | August 2023 | August 2023 |
Exercise price per share (in dollars per share) | $ 21.14 | $ 21.14 |
October 2013 [Member] | Consultants [Member] |  |  |
Options for shares of common stock (in shares) | 750 | 823 |
Granted (in dollars per share) | $ 24.23 | $ 24.23 |
Options exercisable at the end of the year (in shares) | 547 | 479 |
Exercisable through | October 2023 | October 2023 |
Exercise price per share (in dollars per share) | $ 24.23 | $ 24.23 |
March 2014 [Member] | Consultants [Member] |  |  |
Options for shares of common stock (in shares) | 13,100 | 14,438 |
Granted (in dollars per share) | $ 39.86 | $ 39.86 |
Options exercisable at the end of the year (in shares) | 8,187 | 6,422 |
Exercisable through | March 2024 | March 2024 |
Exercise price per share (in dollars per share) | $ 39.86 | $ 39.86 |
May 2014 [Member] | Consultants [Member] |  |  |
Options for shares of common stock (in shares) | 6,850 | 8,700 |
Granted (in dollars per share) | $ 22.01 | $ 22.01 |
Options exercisable at the end of the year (in shares) | 3,704 | 3,444 |
Exercisable through | May 2024 | May 2024 |
Exercise price per share (in dollars per share) | $ 22.01 | $ 22.01 |
November 2014 [Member] | Consultants [Member] |  |  |
Options for shares of common stock (in shares) | 10,246 | 12,000 |
Granted (in dollars per share) | $ 21.66 | $ 21.66 |
Options exercisable at the end of the year (in shares) | 4,364 | 3,250 |
Exercisable through | November 2024 | November 2024 |
Exercise price per share (in dollars per share) | $ 21.66 | $ 21.66 |
August 2014 [Member] | Consultants [Member] |  |  |
Options for shares of common stock (in shares) |  | 219 |
Granted (in dollars per share) |  | $ 21 |
Options exercisable at the end of the year (in shares) |  | 354 |
Exercisable through |  | August 2024 |
Exercise price per share (in dollars per share) |  | $ 21 |
May 2015 [Member] | Consultants [Member] |  |  |
Options for shares of common stock (in shares) | 5,250 | 5,250 |
Granted (in dollars per share) | $ 19.51 | $ 19.51 |
Options exercisable at the end of the year (in shares) | 1,750 |  |
Exercisable through | May 2025 | May 2025 |
Exercise price per share (in dollars per share) | $ 19.51 | $ 19.51 |
February 2016 [Member] | Consultants [Member] |  |  |
Options for shares of common stock (in shares) | 2,500 |  |
Granted (in dollars per share) | $ 16.87 |  |
Options exercisable at the end of the year (in shares) |  |  |
Exercisable through | February 2026 |  |
Exercise price per share (in dollars per share) | $ 16.87 |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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