Description Of Business And Segment Reporting (Summary Of Results Of Operations For Principal Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	$ 65,055	$ 64,511	$ 110,861	$ 104,712
Segment operating income (loss)	1,789	(1,572)	(6,094)	(13,349)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	65,055	64,511	110,861	104,712
Segment operating income (loss)	5,760	3,364	2,150	(3,744)
Intersegment Eliminations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	(1,218)	(1,291)	(2,463)	(2,600)
Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	61,056	61,770	103,042	99,117
Segment operating income (loss)	4,474	3,452	(141)	(3,765)
Real Estate [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	5,217	4,032	10,282	8,195
Segment operating income (loss)	$ 1,286	$ (88)	$ 2,291	$ 21