Segment Information - Segment Data (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 36,970	$ 47,188
Operating Income (Loss):	(266)	998
Capital Expenditures:	646	3,548
Depreciation and Amortization:	609	1,941
Overnight air cargo
Segment Reporting Information [Line Items]
Total revenue	16,171	18,320
Operating Income (Loss):	555	17
Capital Expenditures:	51	8
Depreciation and Amortization:	16	18
Ground equipment sales
Segment Reporting Information [Line Items]
Total revenue	15,828	12,249
Operating Income (Loss):	2,216	1,347
Capital Expenditures:	111	10
Depreciation and Amortization:	68	46
Ground equipment sales | Domestic
Segment Reporting Information [Line Items]
Total revenue	15,811	10,859
Ground equipment sales | International
Segment Reporting Information [Line Items]
Total revenue	17	1,390
Printing equipment and maintenance
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	5
Total revenue	88	64
Operating Income (Loss):	(223)	(382)
Capital Expenditures:	0	0
Depreciation and Amortization:	2	2
Printing equipment and maintenance | Domestic
Segment Reporting Information [Line Items]
Total revenue	7	18
Printing equipment and maintenance | International
Segment Reporting Information [Line Items]
Total revenue	81	46
Commercial Jet Engines and Parts
Segment Reporting Information [Line Items]
Total revenue	4,693	16,327
Operating Income (Loss):	(902)	1,888
Capital Expenditures:	457	3,465
Depreciation and Amortization:	382	1,735
Commercial Jet Engines and Parts | Domestic
Segment Reporting Information [Line Items]
Total revenue	2,470	8,186
Commercial Jet Engines and Parts | International
Segment Reporting Information [Line Items]
Total revenue	2,223	8,141
Corporate and other
Segment Reporting Information [Line Items]
Total revenue	190	228
Operating Income (Loss):	(1,912)	(1,872)
Capital Expenditures:	27	65
Depreciation and Amortization:	$ 141	$ 140