Note 5 - Loans Receivable From Property Development Projects (Details Textual) - Dec. 31, 2024 $ in Thousands, ¥ in Millions	USD ($)	CNY (¥)
Financing Receivable, before Allowance for Credit Loss, Current	$ 274	¥ 2
Financing Receivable, Allowance for Credit Loss	274
Financing Receivable, Allowance for Credit Losses, Current	$ 274

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant