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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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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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