Revenue Recognition - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 36,970	$ 47,188
Air Cargo
Disaggregation of Revenue [Line Items]
Total revenue	16,171	18,320
Air Cargo | Product Sales
Disaggregation of Revenue [Line Items]
Operating Revenues	4,315	5,414
Air Cargo | Support Services
Disaggregation of Revenue [Line Items]
Operating Revenues	11,850	12,894
Air Cargo | Leasing Revenue
Disaggregation of Revenue [Line Items]
Leasing Revenue	0	0
Air Cargo | Other
Disaggregation of Revenue [Line Items]
Other	6	12
Ground equipment sales
Disaggregation of Revenue [Line Items]
Total revenue	15,828	12,249
Ground equipment sales | Product Sales
Disaggregation of Revenue [Line Items]
Operating Revenues	15,738	12,002
Ground equipment sales | Support Services
Disaggregation of Revenue [Line Items]
Operating Revenues	18	105
Ground equipment sales | Leasing Revenue
Disaggregation of Revenue [Line Items]
Leasing Revenue	48	20
Ground equipment sales | Other
Disaggregation of Revenue [Line Items]
Other	24	122
Commercial jet engines and parts
Disaggregation of Revenue [Line Items]
Total revenue	4,693	16,327
Commercial jet engines and parts | Product Sales
Disaggregation of Revenue [Line Items]
Operating Revenues	2,695	11,171
Commercial jet engines and parts | Support Services
Disaggregation of Revenue [Line Items]
Operating Revenues	1,625	1,410
Commercial jet engines and parts | Leasing Revenue
Disaggregation of Revenue [Line Items]
Leasing Revenue	373	3,714
Commercial jet engines and parts | Other
Disaggregation of Revenue [Line Items]
Other	0	32
Printing equipment and maintenance
Disaggregation of Revenue [Line Items]
Operating Revenues	5
Total revenue	88	64
Printing equipment and maintenance | Product Sales
Disaggregation of Revenue [Line Items]
Operating Revenues	28	48
Printing equipment and maintenance | Support Services
Disaggregation of Revenue [Line Items]
Operating Revenues		11
Printing equipment and maintenance | Leasing Revenue
Disaggregation of Revenue [Line Items]
Leasing Revenue	0	0
Printing equipment and maintenance | Other
Disaggregation of Revenue [Line Items]
Other	55	5
Corporate and other
Disaggregation of Revenue [Line Items]
Total revenue	190	228
Corporate and other | Product Sales
Disaggregation of Revenue [Line Items]
Operating Revenues	5	0
Corporate and other | Support Services
Disaggregation of Revenue [Line Items]
Operating Revenues	13	41
Corporate and other | Leasing Revenue
Disaggregation of Revenue [Line Items]
Leasing Revenue	34	45
Corporate and other | Other
Disaggregation of Revenue [Line Items]
Other	$ 138	$ 142