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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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