Note 6 - Related Party Transactions (Details) - Transactions Between the Company and Affiliates (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Related Party Transaction [Line Items]
Services provided by affiliates	$ 7,139	$ 5,632
Field Merchandiser Services (SBS) [Member]
Related Party Transaction [Line Items]
Services provided by affiliates	5,459	4,111
Field Management Services [Member]
Related Party Transaction [Line Items]
Services provided by affiliates	1,178	980
Field Merchandiser Services NMA [Member]
Related Party Transaction [Line Items]
Services provided by affiliates	$ 502	$ 541

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration