Revenue Recognition - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue
Total revenue	$ 43,238	$ 35,604	$ 80,206	$ 72,576
Air Cargo
Disaggregation of Revenue
Total revenue	18,847	17,295	37,697	33,466
Air Cargo | Product Sales
Disaggregation of Revenue
Revenue from customer contracts	5,615	5,728	12,188	10,043
Air Cargo | Support Services
Disaggregation of Revenue
Revenue from customer contracts	13,222	11,558	25,494	23,408
Air Cargo | Leasing Revenue
Disaggregation of Revenue
Revenue not from customer contracts	0	0	0	0
Air Cargo | Other
Disaggregation of Revenue
Revenue not from customer contracts	10	9	15	15
Ground equipment sales
Disaggregation of Revenue
Total revenue	9,189	12,060	17,371	27,888
Ground equipment sales | Product Sales
Disaggregation of Revenue
Revenue from customer contracts	8,928	11,833	16,926	27,571
Ground equipment sales | Support Services
Disaggregation of Revenue
Revenue from customer contracts	69	67	134	84
Ground equipment sales | Leasing Revenue
Disaggregation of Revenue
Revenue not from customer contracts	39	23	78	71
Ground equipment sales | Other
Disaggregation of Revenue
Revenue not from customer contracts	153	137	233	162
Commercial jet engines and parts
Disaggregation of Revenue
Total revenue	14,916	6,114	24,510	10,808
Commercial jet engines and parts | Product Sales
Disaggregation of Revenue
Revenue from customer contracts	13,157	4,283	20,449	6,979
Commercial jet engines and parts | Support Services
Disaggregation of Revenue
Revenue from customer contracts	1,554	956	3,656	2,580
Commercial jet engines and parts | Leasing Revenue
Disaggregation of Revenue
Revenue not from customer contracts	177	791	343	1,164
Commercial jet engines and parts | Other
Disaggregation of Revenue
Revenue not from customer contracts	28	84	62	85
Corporate and other
Disaggregation of Revenue
Total revenue	286	135	628	414
Corporate and other | Product Sales
Disaggregation of Revenue
Revenue from customer contracts	37	0	114	33
Corporate and other | Support Services
Disaggregation of Revenue
Revenue from customer contracts	54	6	117	24
Corporate and other | Leasing Revenue
Disaggregation of Revenue
Revenue not from customer contracts	37	107	76	142
Corporate and other | Other
Disaggregation of Revenue
Revenue not from customer contracts	$ 158	$ 22	$ 321	$ 215