Note 1 - The Company and Summary of Significant Accounting Policies (Details Textual) $ in Millions	3 Months Ended
	Jun. 30, 2016 USD ($)
From Current Deferred Tax Assets to Noncurrent Deferred Tax Assets and Liabilities [Member]
Current Period Reclassification Adjustment	$ (1.1)
From Current Deferred Tax Assets to Noncurrent Deferred Tax Assets [Member]
Current Period Reclassification Adjustment	0.8
From Current Deferred Tax Assets to Noncurrent Deferred Tax Liabilities [Member]
Current Period Reclassification Adjustment	$ (0.3)