Note 2 - Earnings Per Common Share - Earnings Per Common Share (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017
Net earnings attributable to Air T, Inc. Stockholders	$ 1,559,000	$ (672,000)	$ 422,000	$ 968,000	$ 233,000	$ 1,220,000	$ 1,084,000	$ (5,751,000)	$ 2,277,109	$ (3,213,539)
Basic (in dollars per share)	$ 0.76	$ (0.33)	$ 0.21	$ 0.47	$ 0.11	$ 0.60	$ 0.53	$ (2.42)	$ 1.11	$ (1.51)
Diluted (in dollars per share)	$ 0.76	$ (0.33)	$ 0.21	$ 0.47	$ 0.11	$ 0.60	$ 0.53	$ (2.42)	$ 1.11	$ (1.51)
Basic (in shares)									2,042,806	2,125,224
Diluted (in shares)									2,047,685	2,125,224