Net Earnings Per Share - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net (loss) income from continuing operations	$ (3,357)	$ (2,122)	$ (4,314)	$ 1,868
Net Loss (Income) Attributable to Non-controlling Interests	433	(287)	549	(2,660)
Net loss from continuing operations attributable to Air T, Inc. Stockholders	$ (2,924)	$ (2,409)	$ (3,765)	$ (792)
(Loss) Income per share (Note 6)
Basic (in dollars per share)	$ (1.01)	$ (0.80)	$ (1.31)	$ (0.30)
Diluted (in dollars per share)	$ (1.01)	$ (0.80)	$ (1.31)	$ (0.30)
Antidilutive shares excluded from computation of loss per share (shares)	5	0	5	0
Loss from discontinued operations, net of tax	$ 0	$ (235)	$ 0	$ (70)
Gain on sale of discontinued operations, net of tax	4	8,359	4	8,359
Income from discontinued operations attributable to Air T, Inc. stockholders	$ 4	$ 8,124	$ 4	$ 8,289
Income from discontinued operations per share:
Basic (in dollars per share)	$ 0	$ 2.69	$ 0	$ 3.14
Diluted (in dollars per share)	0	2.68	0	3.13
(Loss) Income per share (Note 6)
Basic (in dollars per share)	(1.01)	1.89	(1.31)	2.84
Diluted (in dollars per share)	$ (1.01)	$ 1.88	$ (1.31)	$ 2.83
Antidilutive shares excluded from computation of loss per share (shares)	5	0	5	0
Weighted Average Shares Outstanding:
Basic (in shares)	2,882	3,025	2,882	2,641
Diluted (in shares)	2,882	3,029	2,882	2,645
Continuing Operations
(Loss) Income per share (Note 6)
Antidilutive shares excluded from computation of loss per share (shares)	5	4	5	4
(Loss) Income per share (Note 6)
Antidilutive shares excluded from computation of loss per share (shares)	5	4	5	4