Description Of Business And Segment Reporting (Summary Of Results Of Operations For Principal Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	$ 45,807	$ 40,200
Segment operating income (loss)	(7,880)	(11,780)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	45,807	40,200
Segment operating income (loss)	(3,606)	(7,112)
Intersegment Eliminations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	(1,245)	(1,309)
Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	41,987	37,347
Segment operating income (loss)	(4,612)	(7,216)
Real Estate [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	5,065	4,162
Segment operating income (loss)	$ 1,006	$ 104