Note 5 - Related-party Transactions - Transactions Between the Company and Affiliates (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Services provided by affiliates		$ 2,234	$ 1,988
Due to affiliates		4,569		$ 3,775
NSRS [Member]
Services provided by affiliates		1,840	1,342
Office lease expenses (Mr. Burdekin) [Member]
Services provided by affiliates		6	6
Office Lease Expenses (RJ Holdings) [Member]
Services provided by affiliates		228	173
Office And Vehicle Rental MPT [Member]
Services provided by affiliates		17	16
Vehicle Rental MCPT [Member]
Services provided by affiliates		12	299
Office And Vehicle Rental MHT [Member]
Services provided by affiliates		29	73
Consulting and Administrative Services (CON) [Member]
Services provided by affiliates			12
Legal Services (KMSA) [Member]
Services provided by affiliates		14	23
Warehouse Rental (JFMD) [Member]
Services provided by affiliates		12	13
Consulting and administrative fees (SPARFACTS) [Member]
Services provided by affiliates		76	$ 31
Loans Due to Affiliates [Member] | Local Investors in Australia [Member]
Due to affiliates	[1]	578		586
Loans Due to Affiliates [Member] | Local Investors in Mexico [Member]
Due to affiliates	[1]	623		623
Loans Due to Affiliates [Member] | Local Investors in Brazil [Member]
Due to affiliates	[1]	139		139
Loans Due to Affiliates [Member] | Local Investors In South Africa [Member]
Due to affiliates	[1]	1,223		415
Loans Due to Affiliates [Member] | Local Investors Related to Resource Plus [Member]
Due to affiliates	[1]	266		266
Loans Due from Affiliates [Member] | Local Investors in China [Member]
Due from affiliates		$ 1,740		$ 1,746

[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.