Financial Instruments (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 12,976	$ 10,567
Customers' advances for construction	109,457	103,619
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans payable	4,703	65,000
Mutual funds	25,630	28,576
Cash and cash equivalents	$ 12,976	$ 10,567