Prepaid And Other Assets (Summary Of Prepaid And Other Assets) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2009	Feb. 05, 2007
Prepaid And Other Assets [Abstract]
Prepaid expenses	$ 2,163,000	$ 1,761,000
Prepaid rent	1,093,000	930,000
Income taxes receivable	1,669,000	2,704,000
Prepaid taxes	912,000	646,000
Deposits	214,000	242,000
Restricted cash	7,000	1,342,000
Investment in marketable securities	47,000	42,000
Total prepaid and other current assets	6,105,000	7,667,000
Other non-cinema and non-rental real estate assets	1,134,000	1,134,000
Investment in Reading International Trust I	838,000	838,000	$ 838,000	$ 1,500,000
Straight-line rent asset	4,689,000	4,150,000
Long-term deposits	7,000	7,000
Total other non-current assets	$ 6,668,000	$ 6,129,000