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Note 12 - Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

Income from Operations by Geographic Area [Table Text Block]

		Three Months Ended March 31,
(in thousands)		2018				2017
Income from Operations:
United States		$	30,071			$	24,346
Europe			3,379				4,040
Corporate Unallocated and Japan			(11,722	)			(10,704	)
Total Income from Operations		$	21,728			$	17,682

Long-lived Assets by Geographic Areas [Table Text Block]

		March 31,				December 31,
(in thousands)		2018				2017
Total long-lived assets:
United States		$	145,903			$	125,308
Europe			34,190				33,691
Japan			7,770				7,441
Total Assets		$	187,863			$	166,440

Operating Segments [Member]

Notes Tables

Revenue from External Customers by Geographic Areas [Table Text Block]

		Three Months Ended March 31,
(in thousands)		2018				2017
Revenue:
United States		$	84,167			$	60,176
Europe			19,945				16,999
Japan			3,633				2,992
Total revenue		$	107,745			$	80,167

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