Segment Information - Segment Data (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information
Revenue	$ 45,433	$ 55,819	$ 125,640	$ 128,394
Operating income (loss)	25	1,068	724	(2,881)
Capital expenditures	363	1,747	1,205	3,539
Depreciation and amortization	442	886	1,146	2,644
Air Cargo
Segment Reporting Information
Revenue	18,248	16,322	55,946	49,789
Operating income (loss)	475	490	2,063	1,617
Capital expenditures	15	85	82	228
Depreciation and amortization	14	17	41	52
Air Cargo | Domestic
Segment Reporting Information
Revenue	18,248	16,322	55,694	49,789
Air Cargo | International
Segment Reporting Information
Revenue	0	0	252	0
Ground equipment sales
Segment Reporting Information
Revenue	15,232	20,769	32,603	48,656
Operating income (loss)	1,463	4,229	2,929	7,369
Capital expenditures	97	4	114	115
Depreciation and amortization	81	38	145	152
Ground equipment sales | Domestic
Segment Reporting Information
Revenue	12,835	13,680	26,991	40,486
Ground equipment sales | International
Segment Reporting Information
Revenue	2,397	7,089	5,612	8,170
Commercial jet engines and parts
Segment Reporting Information
Revenue	11,392	18,078	35,902	28,886
Operating income (loss)	336	(1,598)	2,000	(4,776)
Capital expenditures	239	1,656	977	3,166
Depreciation and amortization	234	754	714	2,114
Commercial jet engines and parts | Domestic
Segment Reporting Information
Revenue	8,426	15,851	25,656	22,476
Commercial jet engines and parts | International
Segment Reporting Information
Revenue	2,966	2,227	10,246	6,410
Corporate and other
Segment Reporting Information
Revenue	561	650	1,189	1,063
Operating income (loss)	(2,249)	(2,053)	(6,268)	(7,091)
Capital expenditures	12	2	32	30
Depreciation and amortization	113	77	246	326
Corporate and other | Domestic
Segment Reporting Information
Revenue	456	548	920	811
Corporate and other | International
Segment Reporting Information
Revenue	$ 105	$ 102	$ 269	$ 252