EARNINGS PER COMMON SHARE - Schedule of Earnings Per Share, Basic and Diluted (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
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income from continuing operations	$ 718	$ 581	$ (2,122)	$ 3,991	$ 3,513	$ (1,941)	$ (779)	$ 3,414	$ 3,168	$ 4,207
Net Income Attributable to Non-controlling Interests	(128)	(789)	(287)	(2,373)	(1,116)	(398)	106	(453)	(3,577)	(1,861)
Net (loss) income 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 continuing operations per share (Note 24)
Basic (in dollars per share)	$ 0.20	$ (0.07)	$ (0.80)	$ 0.72	$ 0.79	$ (0.77)	$ (0.22)	$ 0.97	$ (0.15)	$ 0.77
Diluted (in dollars per share)	$ 0.20	$ (0.07)	$ (0.80)	$ 0.72	$ 0.79	$ (0.77)	$ (0.22)	$ 0.96	$ (0.15)	$ 0.77
Antidilutive shares Excluded from Computation of income (loss) per share (in shares)	0	6	0	0	0	8	8	0
Loss from discontinued operations, net of tax									$ (114)	$ (1,006)
Gain on sale of discontinued operations, net of tax									8,179	0
Gain (loss) from discontinued operations attributable to Air T, Inc. stockholders	$ (2)	$ (222)	$ 8,124	$ 165	$ 150	$ (376)	$ (648)	$ (132)	$ 8,065	$ (1,006)
Income (loss) from discontinued operations per share:
Basic (in dollars per share)	$ 0	$ (0.07)	$ 2.69	$ 0.07	$ 0.05	$ (0.12)	$ (0.21)	$ (0.04)	$ 2.89	$ (0.33)
Diluted (in dollars per share)	0	(0.07)	2.68	0.07	0.05	(0.12)	(0.21)	(0.04)	2.88	(0.33)
Income per share:
Basic (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 (in dollars per share)	$ 0.20	$ (0.14)	$ 1.88	$ 0.79	$ 0.84	$ (0.89)	$ (0.43)	$ 0.92	$ 2.73	$ 0.44
Weighted Average Shares Outstanding:
Basic (in shares)									2,791,000	3,052,000
Diluted (in shares)									2,798,000	3,060,000
Continuing Operations
Income (Loss) from continuing operations per share (Note 24)
Antidilutive shares Excluded from Computation of income (loss) per share (in shares)	0	6	5	0	0	8	8	0	7	0
Discontinued Operations
Income (Loss) from continuing operations per share (Note 24)
Antidilutive shares Excluded from Computation of income (loss) per share (in shares)	7	6	0	0	0	8	8	9	0	8