Non-controlling Interests (Summary Of Changes In Controlling And Non-controlling Stockholders’ Equity) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Noncontrolling Interest [Line Items]
Balance	$ (40,407,000)
Balance	32,996,000	$ 63,279,000
Net income (loss)	(13,403,000)	(11,324,000)
Other comprehensive income, net	(2,541,000)	(1,294,000)
Share-based compensation expense	678,000	443,000
Restricted Stock Units	(2,000)	(132,000)
Balance	17,728,000	50,972,000
Balance	(40,407,000)
Additional Paid-In Capital [Member]
Noncontrolling Interest [Line Items]
Balance	155,402,000	153,784,000
Share-based compensation expense	678,000	443,000
Restricted Stock Units	(2,000)	(132,000)
Balance	156,078,000	154,095,000
Retained Earnings (Accumulated Deficit) [Member]
Noncontrolling Interest [Line Items]
Balance	(79,489,000)	(48,816,000)
Net income (loss)	(13,228,000)	(11,111,000)
Balance	(92,717,000)	(59,927,000)
Treasury Shares [Member]
Noncontrolling Interest [Line Items]
Balance	(40,407)	(40,407)
Balance	(40,407)	(40,407)
Accumulated Other Comprehensive Income/(Loss) [Member]
Noncontrolling Interest [Line Items]
Balance	(2,673,000)	(1,957,000)
Other comprehensive income, net	(2,538,000)	(1,293,000)
Balance	(5,211,000)	(3,250,000)
Reading International Inc. Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Balance	33,087,000	62,856,000
Net income (loss)	(13,228,000)	(11,111,000)
Other comprehensive income, net	(2,538,000)	(1,293,000)
Share-based compensation expense	678,000	443,000
Restricted Stock Units	(2,000)	(132,000)
Balance	17,997,000	50,763,000
Noncontrolling Interests [Member]
Noncontrolling Interest [Line Items]
Balance	(91,000)	423,000
Net income (loss)	(175,000)	(213,000)
Other comprehensive income, net	(3,000)	(1,000)
Balance	$ (269,000)	209,000
Class A [Member]
Noncontrolling Interest [Line Items]
Balance, shares	20,666,516
Balance, shares	20,675,185
Class A [Member] | Common Stock Shares Outstanding [Member]
Noncontrolling Interest [Line Items]
Balance	$ 237,000	$ 235,000
Balance, shares	20,664	20,410
Restricted Stock Units, shares	9	89
Balance	$ 237,000	$ 235,000
Balance, shares	20,673	20,499
Class B [Member]
Noncontrolling Interest [Line Items]
Balance, shares	1,680,590
Balance, shares	1,680,590
Class B [Member] | Common Stock Shares Outstanding [Member]
Noncontrolling Interest [Line Items]
Balance	$ 17,000	$ 17,000
Balance, shares	1,681	1,680
Balance	$ 17,000	$ 17,000
Balance, shares	1,681	1,680