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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total | $ (700,000) | $ 2,500,000 | $ (700,000) |
Foreign Currency Transaction Gain (Loss), before Tax, Total | (400,000) | 700,000 | (300,000) |
Contract with Customer, Liability, Total | 0 |  |  |
Inventory, Noncurrent, Total | 3,833,000 |  |  |
Inventory, Net, Current and Noncurrent |  | 22,000,000 |  |
Inventory Adjustments, Total | 3,500,000 | 1,700,000 |  |
Allocated Share-based Compensation Expense, Total | $ 11,046,000 | 5,807,000 | 3,392,000 |
Number of Operating Segments | 1 |  |  |
Number of Reportable Segments | 1 |  |  |
Performance Shares [Member] |  |  |  |
Allocated Share-based Compensation Expense, Total | $ 700,000 | $ 800,000 | $ 300,000 |
Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |  |
Minimum [Member] | Subsequent Event [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | $ 20,000,000
Operating Lease, Liability, Total |  |  |  | 30,000,000
Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 16 years |  |  |
Maximum [Member] | Subsequent Event [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | 23,000,000
Operating Lease, Liability, Total |  |  |  | $ 35,000,000
Other Noncurrent Assets [Member] |  |  |  |
Inventory, Noncurrent, Total | $ 3,800,000 |  |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | DePuy Mitek Inc [Member] |  |  |  |
Concentration Risk, Percentage | 75.00% | 68.00% |  |

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