Net Earnings Per Share - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net income (loss) from continuing operations	$ 1,763	$ 581	$ (2,550)	$ 2,450
Net Loss (Income) Attributable to Non-controlling Interests	335	(789)	884	(3,449)
Net income (loss) from continuing operations attributable to Air T, Inc. Stockholders	$ 2,098	$ (208)	$ (1,666)	$ (999)
Income (Loss) from continuing operations per share:
Basic (in dollars per share)	$ 0.73	$ (0.07)	$ (0.58)	$ (0.36)
Diluted (in dollars per share)	$ 0.73	$ (0.07)	$ (0.58)	$ (0.36)
Antidilutive shares excluded from computation of loss per share (shares)	0	4	5	0
Loss from discontinued operations, net of tax	$ 0	$ 0	$ 0	$ (70)
(Loss) Gain on sale of discontinued operations, net of tax	0	(222)	4	8,137
(Loss) Income from discontinued operations attributable to Air T, Inc. stockholders	$ 0	$ (222)	$ 4	$ 8,067
(Loss) Income from discontinued operations per share:
Basic (in dollars per share)	$ 0	$ (0.07)	$ 0	$ 2.93
Diluted (in dollars per share)	0	(0.07)	0	2.93
Income (Loss) per share:
Basic (in dollars per share)	0.73	(0.14)	(0.58)	2.57
Diluted (in dollars per share)	$ 0.73	$ (0.14)	$ (0.58)	$ 2.57
Weighted Average Shares Outstanding:
Basic (in shares)	2,882	2,973	2,882	2,752
Diluted (in shares)	2,887	2,973	2,882	2,756
Continuing Operations
Income (Loss) from continuing operations per share:
Antidilutive shares excluded from computation of loss per share (shares)	0	4	5	4
Discontinued Operations
Income (Loss) from continuing operations per share:
Antidilutive shares excluded from computation of loss per share (shares)	0	4	0	0