Net Earnings (Loss) Per Share - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net Income (Loss) from continuing operations	$ 8,003	$ (3,357)	$ 8,329	$ (4,314)
Net (income) loss from continuing operations attributable to non-controlling interests	(448)	433	(486)	549
Net income (loss) from continuing operations attributable to Air T, Inc. Stockholders	$ 7,555	$ (2,924)	$ 7,843	$ (3,765)
Income (Loss) from continuing operations per share:
Basic (in dollars per share)	$ 2.62	$ (1.01)	$ 2.72	$ (1.31)
Diluted (in dollars per share)	$ 2.60	$ (1.01)	$ 2.71	$ (1.31)
Antidilutive shares excluded from computation of income (loss) per share (shares)	0	5	0	5
Gain on sale of discontinued operations, net of tax	$ 0	$ 4	$ 0	$ 4
Income from discontinued operation attributable to Air T, Inc. stockholders	$ 0	$ 4	$ 0	$ 4
Income from discontinued operations per share:
Basic (in dollars per share)	$ 0	$ 0	$ 0	$ 0
Diluted (in dollars per share)	0	0	0	0
Income (Loss) per share:
Basic (in dollars per share)	2.62	(1.01)	2.72	(1.31)
Diluted (in dollars per share)	$ 2.60	$ (1.01)	$ 2.71	$ (1.31)
Weighted Average Shares Outstanding:
Basic (in shares)	2,882	2,882	2,882	2,882
Diluted (in shares)	2,901	2,882	2,893	2,882
Continuing Operations
Income (Loss) from continuing operations per share:
Antidilutive shares excluded from computation of income (loss) per share (shares)	0	5	0	5