Note 5 - Related-Party Transactions - Transactions Between the Company and Affiliates (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Services provided by affiliates		$ 668	$ 8,528
Due to affiliates		4,558		$ 4,645
Loans Due to Affiliates [Member] | Local Investors in Australia [Member]
Due to affiliates	[1]	288		226
Loans Due to Affiliates [Member] | Local Investors in Mexico [Member]
Due to affiliates	[1]	1,001		1,001
Loans Due to Affiliates [Member] | Local Investors in Brazil [Member]
Due to affiliates	[1]	139		139
Loans Due to Affiliates [Member] | Local Investors in China [Member]
Due to affiliates	[1]	1,987		2,130
Loans Due to Affiliates [Member] | Local Investors In South Africa [Member]
Due to affiliates	[1]	612		618
Loans Due to Affiliates [Member] | Local Investors Related to Resource Plus [Member]
Due to affiliates	[1]	531		$ 531
Field Specialist Expenses SBS [Member]
Services provided by affiliates	[2]		6,729
Field Administration Expenses SAS [Member]
Services provided by affiliates			1,149
NSRS [Member]
Services provided by affiliates		125
RJ Holdings [Member]
Services provided by affiliates		102	142
Office And Vehicle Rental MPT [Member]
Services provided by affiliates		16	19
Vehicle Rental MCPT [Member]
Services provided by affiliates		290	339
Office And Vehicle Rental MHT [Member]
Services provided by affiliates		64	53
Consulting and Administrative Services (CON) [Member]
Services provided by affiliates		37	59
Legal Services (KMSA) [Member]
Services provided by affiliates		22	26
Warehouse Rental (JFMD) [Member]
Services provided by affiliates		$ 12	$ 12

[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 consolidated financial statements.

[2] Includes substantially all overhead (in the case of SAS and SBS), or related overhead, plus any applicable markup. The services provided by SAS and SBS were terminated as of July 2018.