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%

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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