Note 10 - Coal Mining Liability (Details Textual) € in Millions, $ in Millions	Jan. 02, 2016 EUR (€)	Jan. 02, 2016 USD ($)	Dec. 27, 2014 EUR (€)	Dec. 27, 2014 USD ($)
Loss Contingency, Accrual, Noncurrent	€ 1.8	$ 2.0	€ 1.9	$ 2.4

Amount of loss contingency liability expected to be resolved after one year or beyond the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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