Note 5 - Related-party Transactions - Transactions Between the Company and Affiliates (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Services provided by affiliates		$ 2,140	$ 4,702	$ 5,809	$ 6,190
Due to affiliates	[1]	3,475		3,475		$ 4,666
NSRS [Member]
Services provided by affiliates		1,532	4,088	3,924	4,473
RJ Holdings [Member]
Services provided by affiliates		6	6	18	18
Office lease expenses (Mr. Burdekin) [Member]
Services provided by affiliates		174	162	524	361
Office And Vehicle Rental MPT [Member]
Services provided by affiliates		13	16	40	48
Vehicle Rental MCPT [Member]
Services provided by affiliates		267	294	847	881
Office And Vehicle Rental MHT [Member]
Services provided by affiliates		65	73	196	205
Consulting and Administrative Services (CON) [Member]
Services provided by affiliates		8	29	31	103
Legal Services (KMSA) [Member]
Services provided by affiliates		20	21	77	64
Warehouse Rental (JFMD) [Member]
Services provided by affiliates		12	13	37	37
Sparfacts [Member]
Services provided by affiliates		43		115
Loans Due to Affiliates [Member] | Local Investors in Australia [Member]
Due to affiliates	[1]	609		609		467
Loans Due to Affiliates [Member] | Local Investors in Mexico [Member]
Due to affiliates	[1]	623		623		623
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]	1,430		1,430		2,271
Loans Due to Affiliates [Member] | Local Investors In South Africa [Member]
Due to affiliates	[1]	408		408		635
Loans Due to Affiliates [Member] | Local Investors Related to Resource Plus [Member]
Due to affiliates	[1]	$ 266		$ 266		$ 531

[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.