QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019
Interim Period, Costs Not Allocable [Line Items]
Operating Revenues	$ 65,604	$ 73,300	$ 50,693	$ 47,188	$ 67,329	$ 55,486	$ 40,867	$ 51,820	$ 236,785	$ 215,502
Income (Loss) from continuing operations, net of tax	718	581	(2,122)	3,991	3,513	(1,941)	(779)	3,414	3,168	4,207
Less: (Income) attributable to non-controlling interests	(128)	(789)	(287)	(2,373)	(1,116)	(398)	106	(453)	(3,577)	(1,861)
Income (Loss) from continuing operations attributable to Air T, Inc. Stockholders	590	(208)	(2,409)	1,618	2,397	(2,339)	(673)	2,961	(409)	2,346
Income (Loss) from discontinued operations, net of tax	$ (2)	$ (222)	$ 8,124	$ 165	$ 150	$ (376)	$ (648)	$ (132)	$ 8,065	$ (1,006)
Basic Income (Loss) per share from continuing operations (in dollars per share)	$ 0.20	$ (0.07)	$ (0.80)	$ 0.72	$ 0.79	$ (0.77)	$ (0.22)	$ 0.97	$ (0.15)	$ 0.77
Basic Income (Loss) per share from discontinued operations (in dollars per share)	0	(0.07)	2.69	0.07	0.05	(0.12)	(0.21)	(0.04)	2.89	(0.33)
Basic Earnings (Loss) per share (in dollars per share)	0.20	(0.14)	1.89	0.79	0.84	(0.89)	(0.43)	0.92	2.74	0.44
Diluted Income (Loss) per share from continuing operations (in dollars per share)	0.20	(0.07)	(0.80)	0.72	0.79	(0.77)	(0.22)	0.96	(0.15)	0.77
Diluted Income (loss) per share from discontinued operations (in dollars per share)	0	(0.07)	2.68	0.07	0.05	(0.12)	(0.21)	(0.04)	2.88	(0.33)
Diluted Earnings (Loss) per share (in dollars per share)	$ 0.20	$ (0.14)	$ 1.88	$ 0.79	$ 0.84	$ (0.89)	$ (0.43)	$ 0.92	$ 2.73	$ 0.44
Antidilutive shares Excluded from Computation of income (loss) per share (in shares)	0	6	0	0	0	8	8	0
Continuing Operations
Interim Period, Costs Not Allocable [Line Items]
Antidilutive shares Excluded from Computation of income (loss) per share (in shares)	0	6	5	0	0	8	8	0	7	0
Discontinued Operations
Interim Period, Costs Not Allocable [Line Items]
Antidilutive shares Excluded from Computation of income (loss) per share (in shares)	7	6	0	0	0	8	8	9	0	8