Revenue Recognition - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total	$ 50,693	$ 40,867	$ 97,881	$ 92,687
Air Cargo
Disaggregation of Revenue [Line Items]
Total	19,745	17,064	38,064	34,705
Air Cargo | Product Sales
Disaggregation of Revenue [Line Items]
Total	6,680	5,003	12,094	10,523
Air Cargo | Support Services
Disaggregation of Revenue [Line Items]
Total	13,033	11,985	25,927	24,082
Air Cargo | Leased Assets
Disaggregation of Revenue [Line Items]
Total	0	0	0	0
Air Cargo | Product and Service, Other
Disaggregation of Revenue [Line Items]
Total	32	76	43	100
Ground equipment sales
Disaggregation of Revenue [Line Items]
Total	12,741	12,838	24,991	19,224
Ground equipment sales | Product Sales
Disaggregation of Revenue [Line Items]
Total	12,489	12,447	24,492	18,617
Ground equipment sales | Support Services
Disaggregation of Revenue [Line Items]
Total	105	148	210	249
Ground equipment sales | Leased Assets
Disaggregation of Revenue [Line Items]
Total	33	15	53	46
Ground equipment sales | Product and Service, Other
Disaggregation of Revenue [Line Items]
Total	114	228	236	312
Commercial jet engines and parts
Disaggregation of Revenue [Line Items]
Total	17,801	10,643	34,128	37,963
Commercial jet engines and parts | Product Sales
Disaggregation of Revenue [Line Items]
Total	13,218	7,380	24,388	32,409
Commercial jet engines and parts | Support Services
Disaggregation of Revenue [Line Items]
Total	1,597	1,327	3,007	2,293
Commercial jet engines and parts | Leased Assets
Disaggregation of Revenue [Line Items]
Total	2,941	1,826	6,655	3,027
Commercial jet engines and parts | Product and Service, Other
Disaggregation of Revenue [Line Items]
Total	45	110	78	234
Printing equipment and maintenance
Disaggregation of Revenue [Line Items]
Total	249	139	313	439
Printing equipment and maintenance | Product Sales
Disaggregation of Revenue [Line Items]
Total	20	122	68	409
Printing equipment and maintenance | Support Services
Disaggregation of Revenue [Line Items]
Total	225	12	236	20
Printing equipment and maintenance | Leased Assets
Disaggregation of Revenue [Line Items]
Total	0	0	0	0
Printing equipment and maintenance | Product and Service, Other
Disaggregation of Revenue [Line Items]
Total	4	5	9	10
Corporate and other
Disaggregation of Revenue [Line Items]
Total	157	183	385	356
Corporate and other | Product Sales
Disaggregation of Revenue [Line Items]
Total	0	0	0	0
Corporate and other | Support Services
Disaggregation of Revenue [Line Items]
Total	(8)	16	33	16
Corporate and other | Leased Assets
Disaggregation of Revenue [Line Items]
Total	36	32	81	72
Corporate and other | Product and Service, Other
Disaggregation of Revenue [Line Items]
Total	$ 129	$ 135	$ 271	$ 268