Note 15 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Jan. 01, 2018	Jan. 01, 2017
Convertible Debt, Fair Value Disclosures	$ 512,428	$ 555,200

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

No definition available.

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