Note 2 - Recent Accounting Pronouncements and Accounting Changes (Details Textual) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Dec. 31, 2015	Mar. 31, 2015
Adjustments for New Accounting Principle, Early Adoption [Member] \| Reclassification from Current Deferred Tax Assets to Noncurrent Deferred Tax Assets [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 7.1	$ 7.1

Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration