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Note 17 - Segment Reporting - Income From Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income from operations	$ 72,226	$ 61,767	$ 67,149
Operating Segments [Member] | United States Segment [Member]
Income from operations	103,136	89,308	86,450
Operating Segments [Member] | Europe Segment [Member]
Income from operations	12,846	11,657	13,304
Corporate and Reconciling Items [Member] | Corporate Unallocated and Japan Segment[Member]
Income from operations	$ (43,756)	$ (39,198)	$ (32,605)

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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