Note 10 - Related Party Transactions (Detail) - Transactions between the Company and affiliates (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Services provided by affiliates:
Services provided by affiliates	$ 25,375	$ 21,915
Field Merchandiser Services SMS [Member]
Services provided by affiliates:
Services provided by affiliates	19,236	17,555
Field Management Services [Member]
Services provided by affiliates:
Services provided by affiliates	4,538	4,283
Field Merchandiser Services NMA [Member]
Services provided by affiliates:
Services provided by affiliates	1,601
Handheld Computer Leases [Member]
Services provided by affiliates:
Services provided by affiliates		$ 77