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Note 8 - Related-party Transactions - Transactions Between the Company and Affiliates (Details) - Related Party [Member] - USD ($) $ in Thousands		Mar. 31, 2023	Dec. 31, 2022
Due to affiliates	[1]	$ 2,855	$ 2,964
Loans Due to Affiliates [Member] | Local Investors in China [Member]
Due to affiliates	[1]	1,301
Loans Due to Affiliates [Member] | Local Investors in Mexico [Member]
Due to affiliates	[1]	623	623
Loans Due to Affiliates [Member] | Local Investors in Australia [Member]
Due to affiliates	[1]	665	693
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 to affiliates	[1]		$ 1,382
[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.

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- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(15)(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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