Equity Method Investments - Summarized Unaudited Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Schedule of Equity Method Investments
Revenue	$ 55,819		$ 73,300		$ 128,394		$ 171,181
Operating income (loss)	1,068		3,720		(2,881)		5,185
Net income (loss)	2,098		(430)		(1,662)		7,068
Net income (loss) attributable to Air T, Inc. stockholders	$ 510		$ (282)		$ (546)		$ (636)
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments
Revenue		$ 27,327		$ 25,325		$ 61,402		$ 85,546
Gross Profit		3,231		1,071		5,196		4,688
Operating income (loss)		891		(2,374)		(3,496)		(5,746)
Net income (loss)		2,242		(2,556)		(2,075)		(6,528)
Net income (loss) attributable to Air T, Inc. stockholders		$ 355		$ (285)		$ (705)		$ (749)