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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | $ 2,500 | $ (700) | $ (2,200)
Foreign Currency Transaction Gain (Loss), before Tax | $ 700 | $ (300) | $ (400)
Concentration Risk, Percentage | 100.00% | 100.00% | 100.00%
Inventory, Net | $ 22,035 | $ 15,983 |
Inventory Adjustments | 1,700 | 900 |
Allocated Share-based Compensation Expense | 5,807 | 3,392 | $ 2,225
Reclassification from Net Cash Used in Financing Activities to Net Cash Provided by Operating Activities [Member] | Year Ended December 31, 2016 [Member] |  |  |
Prior Period Reclassification Adjustment | 600 |  |
Reclassification from Net Cash Used in Financing Activities to Net Cash Provided by Operating Activities [Member] | Year Ended December 31, 2015 [Member] |  |  |
Prior Period Reclassification Adjustment | 800 |  |
Performance Shares [Member] |  |  |
Allocated Share-based Compensation Expense | 800 | 300 | 400
Research and Development Expense [Member] |  |  |
Allocated Share-based Compensation Expense | $ 564 | $ 467 | 269
In Process Research Development [Member] | Research and Development Expense [Member] |  |  |
Impairment of Intangible Assets, Finite-lived |  |  | $ 700
Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 16 years |  |
Machinery and Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 54 years |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | DePuy Mitek Inc [Member] |  |  |
Concentration Risk, Percentage | 68.00% | 66.00% |

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