Note 5 - Related-party Transactions - Transactions Between the Company and Affiliates (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Field Merchandiser Services SBS [Member]
Services provided by affiliates:
Services provided by affiliates	$ 5,491	$ 5,022	$ 15,828	$ 16,034
Field Administration Expenses SAS [Member]
Services provided by affiliates:
Services provided by affiliates	1,011	1,080	3,138	3,334
Field Merchandiser Services NRS [Member]
Services provided by affiliates:
Services provided by affiliates		471		1,038
Office And Vehicle Rental MPT [Member]
Services provided by affiliates:
Services provided by affiliates	8	1	32	30
Vehicle Rental MCPT [Member]
Services provided by affiliates:
Services provided by affiliates	245	197	618	757
Office And Vehicle Rental MHT [Member]
Services provided by affiliates:
Services provided by affiliates	34	39	85	89
Field Management Services NDS Tanitim [Member]
Services provided by affiliates:
Services provided by affiliates				15
Field Merchandiser Services NDS Reklam [Member]
Services provided by affiliates:
Services provided by affiliates	1	63	1	180
Consulting and Administrative Services (CON) [Member]
Services provided by affiliates:
Services provided by affiliates	74	89	241	279
Warehouse Rental (JFMD) [Member]
Services provided by affiliates:
Services provided by affiliates	3		3
Services provided by affiliates	$ 6,867	$ 6,962	$ 19,946	$ 21,756