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Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 8,436 $ 4,612
Customers' advances for construction 120,154 128,755
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans payable 143,017 160,123
Mutual funds 30,320 26,442
Cash and cash equivalents $ 8,436 $ 4,612