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Note 3 - Revenue by Product Group, by Significant Customer and by Geographic Location; Geographic Information (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2003 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue from Contract with Customer, Excluding Assessed Tax, Total |  |  | $ 26,956,000 | $ 26,787,000 | $ 30,548,000 | $ 21,264,000 | $ 29,388,000 | $ 27,184,000 | $ 33,462,000 | $ 23,386,000 | $ 105,555,000 | $ 113,420,000 | $ 103,379,000
Inventory Recall Expense |  |  |  |  |  | $ 1,100,000 |  |  |  |  |  | $ 900,000 |
Mitek ORTHOVISC Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
License Agreement Term |  | 10 years |  |  |  |  |  |  |  |  |  |  |
License Agreement Additional Term |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Mitek MONOVISC Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
License Agreement Term | 15 years |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition, Milestone Method, Revenue Milestone in Twelve Month Period |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |
Mitek MONOVISC Agreement [Member] | Milestone Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 5,000,000 | $ 0
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | DePuy Mitek Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  |  | 73.00% | 73.00% | 75.00%

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