Net Earnings Per Share - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income (loss) from continuing operations	$ (2,122)	$ (779)	$ 1,868	$ 2,561
Net (income) loss from continuing operations attributable to non-controlling interests	(287)	106	(2,660)	(348)
Net income (loss) from continuing operations attributable to Air T, Inc. stockholders	$ (2,409)	$ (673)	$ (792)	$ 2,213
Income (loss) from continuing operations per share:
Basic (in dollars per share)	$ (0.80)	$ (0.22)	$ (0.30)	$ 0.72
Diluted (in dollars per share)	$ (0.80)	$ (0.22)	$ (0.30)	$ 0.72
Loss from discontinued operations, net of tax	$ (235)	$ (648)	$ (70)	$ (705)
Gain on sale of discontinued operations, net of tax	8,359	0	8,359	0
Gain (loss) from discontinued operations attributable to Air T, Inc. stockholders	$ 8,124	$ (648)	$ 8,289	$ (705)
Income (loss) from discontinued operations per share:
Basic (in dollars per share)	$ 2.69	$ (0.21)	$ 3.14	$ (0.23)
Diluted (in dollars per share)	$ 2.68	$ (0.21)	$ 3.13	$ (0.23)
Weighted Average Shares Outstanding:
Basic (in shares)	3,025,000	3,066,000	2,641,000	3,066,000
Diluted (in shares)	3,029,000	3,066,000	2,645,000	3,074,000