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Note 2 - Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Property, Plant and Equipment Estimated Useful Life [Table Text Block] |
|  |  | % |
Computer equipment |  |  | 33 |
Office furniture and equipment |  | 7 | - | 15
Leasehold improvements |  |  | Over the shorter of the lease term or estimated useful life |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year ended December 31,
|  | 2016 |  | 2015 |  | 2014
Dividend yield |  |  | 0 | % |  |  | 0% |  |  |  | 0% |
Expected volatility |  |  | 62.1 | % |  |  | 65% |  |  | 60% | - | 64%
Risk-free interest |  |  | 1.42 | % |  | 1.94 | - | 2.00% |  | 1.97 | - | 2.30%
Expected life |  |  | 6.25 |  |  |  | 6.25 |  |  |  | 6.25 |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] |
|  | Liabilities as of December 31, 2016 |  | Liabilities as of December 31, 2015
|  | Notional Amount |  | Fair Value |  | Notional Amount |  | Fair Value
Foreign Exchange Forward Contract Derivatives in cash flow hedging relationships—included in accrued expenses and other liabilities |  | $ | 46,116 |  |  | $ | (479 | ) |  | $ | 36,070 |  |  | $ | (331 | )

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 + 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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- Definition Tabular disclosure of the useful life physical assets used in the normal conduct of business and not intended for resale. + References No definition available. + Details
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