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Note 11 - Recent Accounting Pronouncements (Details Textual) $ in Millions	1 Months Ended
	Jan. 31, 2017 USD ($)
Accounting Standards Update 2016-09 [Member]
Deferred Tax Assets, Gross	$ 0.3
Deferred Tax Assets, Valuation Allowance	0.3
Reclassification of Excess Tax Benefits Between Financing and Operating Cash Flows [Member] | Three Months Ended March 31, 2016 [Member]
Prior Period Reclassification Adjustment	4.4
Additional Paid-in Capital [Member] | Accounting Standards Update 2016-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	(0.2)
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 0.2

X

- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

+ References

No definition available.

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X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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- Definition

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+ References

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