Equity Method Investments - Summarized Unaudited Financial Information (Details) - USD ($)	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Net income (loss) attributable to Air T, Inc. stockholders	$ (320,578)	$ 9,183
Insignia
Revenue	5,140,000	7,419,000
Gross Profit	774,000	2,746,000
Operating income (loss)	(1,337,000)	232,000
Net income (loss)	(1,096,000)	164,000
Net income (loss) attributable to Air T, Inc. stockholders	$ (322,000)	$ 5,000