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Note 15 - Revenue by Product Group, by Significant Customer and by Geographic Location; Geographic Information (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2003 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2012
Concentration Risk, Percentage |  |  | 100.00% | 100.00% | 100.00% |
Sales Revenue, Services, Net |  |  | $ 5,637,000 | $ 447,000 | $ 5,303,000 |
Mitek ORTHOVISC Agreement [Member] |  |  |  |  |  |
License Agreement Term |  | 10 years |  |  |  |
License Agreement Additional Term |  |  | 5 years |  |  | 5 years
Mitek MONOVISC Agreement [Member] |  |  |  |  |  |
License Agreement Term | 15 years |  |  |  |  |
Revenue Recognition, Milestone Method, Revenue Recognized |  |  | $ 5,000,000 | $ 0 | 5,000,000 |
Revenue Recognition, Milestone Method, Revenue Milestone in Twelve Month Period |  |  | $ 100,000,000 |  | $ 50,000,000 |
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | DePuy Mitek Inc [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 73.00% | 75.00% | 72.00% |

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