Description Of Business And Segment Reporting (Summary Of Results Of Operations For Principal Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	$ 66,563	$ 51,196	$ 177,425	$ 155,908
Segment operating income (loss)	1,019	(6,731)	(5,073)	(20,080)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	66,563	51,196	177,425	155,908
Segment operating income (loss)	5,315	(2,282)	7,468	(6,027)
Intersegment Eliminations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	(1,181)	(1,232)	(3,644)	(3,833)
Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	62,688	48,358	165,731	147,476
Segment operating income (loss)	4,395	(2,137)	4,256	(5,902)
Real Estate [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	5,056	4,070	15,338	12,265
Segment operating income (loss)	$ 920	$ (145)	$ 3,212	$ (125)