Note 6 - Related-party Transactions - Transactions Between the Company and Affiliates (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Services provided by affiliates		$ 3,000	$ 8,631	$ 19,406	$ 24,111
Due to affiliates		5,114		5,114		$ 3,026
Loans Due to Affiliates [Member] | Local Investors in Australia [Member]
Due to affiliates	[1]	231		231		250
Loans Due to Affiliates [Member] | Local Investors in Mexico [Member]
Due to affiliates	[1]	1,001		1,001		1,001
Loans Due to Affiliates [Member] | Local Investors in Brazil [Member]
Due to affiliates	[1]	139		139		139
Loans Due to Affiliates [Member] | Local Investors in China [Member]
Due to affiliates	[1]	2,941		2,941		719
Loans Due to Affiliates [Member] | Local Investors In South Africa [Member]
Due to affiliates	[1]	16		16		24
Loans Due to Affiliates [Member] | Local Investors Related to Resource Plus [Member]
Due to affiliates	[1]	731		731
Accrued Expenses Due to Affiliates [Member] | SBS [Member]
Due to affiliates		55		55		$ 893
Field Merchandiser Services SBS [Member]
Services provided by affiliates		2,063	6,788	15,353	19,593
Field Administration Expenses SAS [Member]
Services provided by affiliates		475	1,044	2,738	3,178
Office And Vehicle Rental MPT [Member]
Services provided by affiliates		15	30	44	46
Vehicle Rental MCPT [Member]
Services provided by affiliates		292	579	839	870
Office And Vehicle Rental MHT [Member]
Services provided by affiliates		53	85	142	126
Consulting and Administrative Services (CON) [Member]
Services provided by affiliates		49	61	160	181
Legal Services (KMSA) [Member]
Services provided by affiliates		40	31	93	79
Warehouse Rental (JFMD) [Member]
Services provided by affiliates		$ 13	$ 13	$ 37	$ 38

[1] Represent loans from the local investors into the Company's subsidiaries (representing their proportionate share of working capital loans). The loans have no payment terms and are due on demand and as such have been classified as current liabilities in the Company's condensed consolidated financial statements.