Equity Method Investments - Summarized Unaudited Financial Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Net income (loss) attributable to Air T, Inc. stockholders	$ (282,000)	$ 201,000	$ (636,000)		$ 371,000
Insignia
Revenue				$ 15,636,000		$ 25,119,000
Gross Profit				3,165,000		9,314,000
Operating income (loss)				(3,091,000)		1,331,000
Net income (loss)				(2,562,000)		993,000
Net income (loss) attributable to Air T, Inc. stockholders	$ 284,975			$ (749,000)		$ 203,000