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Note 6 - Related-party Transactions - Transactions Between the Company and Affiliates (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Due to affiliates |  | $ 3,333 | $ 3,270
Loans Due to Affiliates [Member] | Local Investors in Australia [Member] |  |  |
Due to affiliates | [1] | 656 | 597
Loans Due to Affiliates [Member] | Local Investors in Mexico [Member] |  |  |
Due to affiliates | [1] | 623 | 623
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 |  | $ 1,788 | $ 1,784
[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.

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