Related Parties (Schedule Of Related Party Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction, Expenses from Transactions with Related Party	$ 3,791	$ 2,775	$ 2,609
Leasing Agent Fees [Member]
Related Party Transaction, Expenses from Transactions with Related Party	434	125	31
Operation Of Parking Garages [Member]
Related Party Transaction, Expenses from Transactions with Related Party	111	100	71
Building Management Fees [Member]
Related Party Transaction, Expenses from Transactions with Related Party	2,202	2,118	2,046
Property Construction Management Fees [Member]
Related Party Transaction, Expenses from Transactions with Related Party	360	184	143
Tower's project consulting fees
Related Party Transaction, Expenses from Transactions with Related Party	419	0	84
Dividends Paid On Company Stock Held By Tower [Member]
Related Party Transaction, Expenses from Transactions with Related Party	$ 265	$ 248	$ 234