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Note 2 - Basis of Presentation (Details Textual) - Decrease in Net Revenues and Sales and Marketing Expense [Member] $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)
Three Months Ended June 30, 2016 [Member]
Prior Period Reclassification Adjustment	$ 0.3
Six Months Ended June 30, 2016 [Member]
Prior Period Reclassification Adjustment	$ 1.1

X

- Definition

The amount of a reclassification adjustment made to prior period financial statement amounts.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: