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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | $ (700) | $ (2,200) | $ (2,800)
Foreign Currency Transaction Gain (Loss), before Tax | $ (300) | $ (400) | $ (600)
Concentration Risk, Percentage | 100.00% | 100.00% | 100.00%
Inventory, Net | $ 15,983 | $ 14,938 |
Inventory Adjustments | 900 | 900 |
Allocated Share-based Compensation Expense | $ 3,392 | 2,225 | $ 1,607
Number of Reportable Segments | 1 |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities | $ 0 | 0 |
Performance Shares [Member] |  |  |
Allocated Share-based Compensation Expense | 300 | 400 | 0
Research and Development Expense [Member] |  |  |
Allocated Share-based Compensation Expense | 467 | 269 | $ 202
In Process Research Development [Member] | Research and Development Expense [Member] |  |  |
Impairment of Intangible Assets, Finite-lived | $ 700 | $ 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 | 2 years |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |
Furniture and Fixtures [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Furniture and Fixtures [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | DePuy Mitek Inc [Member] |  |  |
Concentration Risk, Percentage | 66.00% | 60.00% |

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