Note 9 - Business Acquisitions (Details Textual) - shares shares in Billions		12 Months Ended
Jun. 26, 2015	Dec. 31, 2016
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	70	70
Maximum [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	130	130

Number of shares of equity interests issued or issuable to acquire entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Name:	us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration