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Note 2 - Revenue Recognition - Impact of Adoption of New Standard on Financial Statements (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues: |  |  |
Revenues | $ 77,877,000 | $ 87,507,000 | $ 72,653,000
Cost of revenues | 7,951,000 | 6,953,000 | 6,086,000
Gross profit | 69,926,000 | 80,554,000 | 66,567,000
Operating expenses: |  |  |
Sales and marketing | 12,161,000 | 12,572,000 | 11,540,000
Other operating expenses | 59,010,000 |  |
Total operating expenses | 71,171,000 | 64,681,000 | 52,181,000
Operating loss | (1,245,000) | 15,873,000 | 14,386,000
Financial income, net (Note 12) | 3,418,000 | 3,026,000 | 2,039,000
Revaluation of investment in other company | (870,000) | 0 | 0
Income (loss) before taxes on income | 1,303,000 | 18,899,000 | 16,425,000
Income taxes | 729,000 | 1,871,000 | 3,325,000
Net income | $ 574,000 | $ 17,028,000 | $ 13,100,000
Basic net income per share (in dollars per share) | $ 0.03 | $ 0.78 | $ 0.63
Diluted net income per share (in dollars per share) | $ 0.03 | $ 0.75 | $ 0.61
Trade receivables | $ 26,156,000 | $ 16,494,000 |
Prepaid expenses and other current assets | 5,264,000 | 3,747,000 |
Retained earnings | 62,853,000 | 53,873,000 |
Accounting Standards Update 2014-09 [Member] |  |  |
Revenues: |  |  |
Revenues | 4,078,000 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |
Revenues: |  |  |
Revenues | 73,799,000 |  |
Cost of revenues | 7,951,000 |  |
Gross profit | 65,848,000 |  |
Operating expenses: |  |  |
Sales and marketing | 12,139,000 |  |
Other operating expenses | 59,010,000 |  |
Total operating expenses | 71,149,000 |  |
Operating loss | (5,301,000) |  |
Financial income, net (Note 12) | 3,418,000 |  |
Revaluation of investment in other company | (870,000) |  |
Income (loss) before taxes on income | (2,753,000) |  |
Income taxes | 356,000 |  |
Net income | $ (3,109,000) |  |
Basic net income per share (in dollars per share) | $ (0.14) |  |
Diluted net income per share (in dollars per share) | $ (0.14) |  |
Trade receivables | $ 12,875,000 |  |
Prepaid expenses and other current assets | 6,307,000 |  |
Retained earnings | 50,615,000 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenues: |  |  |
Revenues | 4,078,000 |  |
Cost of revenues |  |  |
Gross profit | 4,078,000 |  |
Operating expenses: |  |  |
Sales and marketing | 22,000 |  |
Other operating expenses |  |  |
Total operating expenses | 22,000 |  |
Operating loss | 4,056,000 |  |
Financial income, net (Note 12) |  |  |
Revaluation of investment in other company |  |  |
Income (loss) before taxes on income | 4,056,000 |  |
Income taxes | 373,000 |  |
Net income | $ 3,683,000 |  |
Basic net income per share (in dollars per share) | $ 0.17 |  |
Diluted net income per share (in dollars per share) | $ 0.16 |  |
Trade receivables | $ 13,281,000 |  |
Prepaid expenses and other current assets | (1,043,000) |  |
Retained earnings | 12,238,000 |  |
License [Member] |  |  |
Revenues: |  |  |
Revenues | 40,446,000 | $ 42,899,000 | $ 31,874,000
License [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |
Revenues: |  |  |
Revenues | 35,873,000 |  |
License [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenues: |  |  |
Revenues | 4,573,000 |  |
Royalties [Member] |  |  |
Revenues: |  |  |
Revenues | 37,431,000 |  |
Royalties [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |
Revenues: |  |  |
Revenues | 37,926,000 |  |
Royalties [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenues: |  |  |
Revenues | $ (495,000) |  |

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