Note 20 - Quarterly Financial Information (Unaudited) - Quarterly Financial Information (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
Operating Revenues	$ 53,460,000	$ 44,501,000	$ 48,861,000	$ 47,697,000	$ 43,687,000	$ 35,769,000	$ 38,523,000	$ 30,493,000	$ 194,519,345	$ 148,471,659
Operating Income	1,005,000	552,000	476,000	2,213,000	1,311,000	1,639,000	1,022,000	(7,073,000)	4,245,523	(3,100,773)
Net Income (Loss) 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 Earnings (Loss) per share (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)