CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Revenues [Abstract]
Revenues	$ 71,579,000	$ 69,005,000
Costs and operating expenses:
Hotel operating expenses	(40,103,000)	(40,717,000)
Recovery of legal settlement costs	5,775,000	0
Real estate operating expenses	(7,579,000)	(7,166,000)
Depreciation and amortization expense	(5,054,000)	(5,305,000)
General and administrative expense	(3,053,000)	(2,821,000)
Total costs and operating expenses	(50,014,000)	(56,009,000)
Income from operations	21,565,000	12,996,000
Other income (expense):
Interest expense - mortgage	(9,767,000)	(9,604,000)
Net loss on marketable securities	(1,777,000)	(3,496,000)
Net unrealized loss on other investments	(42,000)	0
Impairment loss on other investments	(200,000)	(178,000)
Dividend and interest income	277,000	287,000
Trading and margin interest expense	(1,187,000)	(1,160,000)
Net other expense	(12,696,000)	(14,151,000)
Income (loss) before income taxes	8,869,000	(1,155,000)
Income tax expense	(3,056,000)	(521,000)
Net income (loss)	5,813,000	(1,676,000)
Less: Net (income) loss attributable to the noncontrolling interest	(1,732,000)	23,000
Net income (loss) attributable to InterGroup	$ 4,081,000	$ (1,653,000)
Net income (loss) per share
Basic	$ 2.47	$ (0.71)
Diluted	2.18	(0.71)
Net income (loss) per share attributable to InterGroup
Basic	1.73	(0.70)
Diluted	$ 1.53	$ (0.70)
Weighted average number of common shares outstanding	2,354,489	2,371,765
Weighted average number of diluted shares outstanding	2,672,489	2,371,765
Hotel [Member]
Revenues [Abstract]
Revenues	$ 57,099,000	$ 54,334,000
Real Estate [Member]
Revenues [Abstract]
Revenues	$ 14,480,000	$ 14,671,000