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Note 12 - Segment Reporting - Income From Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income from operations	$ 21,728	$ 17,682
Operating Segments [Member] | United States Segment [Member]
Income from operations	30,071	24,346
Operating Segments [Member] | Europe Segment [Member]
Income from operations	3,379	4,040
Corporate and Reconciling Items [Member] | Corporate Unallocated and Japan Segment[Member]
Income from operations	$ (11,722)	$ (10,704)

X

- Definition

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

+ References

No definition available.

+ Details

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- Details

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- Details

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X

- Details

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- Details

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- Details

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