Note 13 - Commitments and Contingencies (Details Textual) $ in Millions	Dec. 31, 2018 USD ($)
Capital Addition Purchase Commitments [Member]
Purchase Obligation, Future Minimum Payments, Remainder of Fiscal Year	$ 162.9
Line of Credit [Member]
Letters of Credit Outstanding, Amount	$ 31.7

Minimum amount of purchase arrangement maturing in the remainder of the fiscal year following the latest fiscal year ended. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

No definition available.

Name:	us-gaap_PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant