Net Earnings Per Share - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income (loss) from continuing operations	$ 581	$ (1,941)	$ 2,450	$ 694
Net income from continuing operations attributable to non-controlling interests	(789)	(398)	(3,449)	(745)
Net loss from continuing operations attributable to Air T, Inc. stockholders	$ (208)	$ (2,339)	$ (999)	$ (51)
Loss from continuing operations per share:
Basic (in dollars per share)	$ (0.07)	$ (0.77)	$ (0.36)	$ (0.02)
Diluted (in dollars per share)	$ (0.07)	$ (0.77)	$ (0.36)	$ (0.02)
Loss from discontinued operations, net of tax	$ 0	$ (376)	$ (70)	$ (1,156)
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	(222)	0	8,137	0
Gain (loss) from discontinued operations attributable to Air T, Inc. stockholders	$ (222)	$ (376)	$ 8,067	$ (1,156)
Income (loss) from discontinued operations per share:
Basic (in dollars per share)	$ (0.07)	$ (0.12)	$ 2.93	$ (0.38)
Diluted (in dollars per share)	(0.07)	(0.12)	2.93	(0.38)
Income (Loss) per share:
Basic (in dollars per share)	(0.14)	(0.89)	2.57	(0.40)
Diluted (in dollars per share)	$ (0.14)	$ (0.89)	$ 2.57	$ (0.40)
Weighted Average Shares Outstanding:
Basic (in shares)	2,973,000	3,042,000	2,752,000	3,058,000
Diluted (in shares)	2,973,000	3,042,000	2,756,000	3,058,000