Note 6 - Equity Method Investments - Summarized Unaudited Financial Information (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	[1]
Net income attributable to Air T, Inc. stockholders	$ 340,714		$ (14,644)
Insignia [Member]
Revenue		$ 33,236,000		$ 26,430,000
Gross Profit		12,561,000		8,401,000
Operating income (loss)		1,832,000		(908,000)
Net income (loss)	$ 391,000	1,399,000	$ 722,000	(639,000)
Net income attributable to Air T, Inc. stockholders		$ 391,000

[1] Amounts represent results since The Fence Store's inception in May, 2017