Segment Information - Segment Data (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Operating revenues	$ 55,819	$ 73,300	$ 128,394	$ 171,181
Operating income (loss)	1,068	3,720	(2,881)	5,185
Capital expenditures	1,747	17,782	3,539	35,576
Depreciation and amortization	886	975	2,644	4,610
Air Cargo
Segment Reporting Information [Line Items]
Operating revenues	16,322	18,706	49,789	56,771
Operating income (loss)	490	638	1,617	909
Capital expenditures	85	140	228	196
Depreciation and amortization	17	18	52	55
Ground equipment sales
Segment Reporting Information [Line Items]
Operating revenues	20,769	15,949	48,656	40,939
Operating income (loss)	4,229	1,644	7,369	4,212
Capital expenditures	4	834	115	844
Depreciation and amortization	38	75	152	177
Ground equipment sales | Domestic
Segment Reporting Information [Line Items]
Operating revenues	13,680	13,505	40,486	36,466
Ground equipment sales | International
Segment Reporting Information [Line Items]
Operating revenues	7,089	2,444	8,170	4,473
Commercial Jet Engines and Parts
Segment Reporting Information [Line Items]
Operating revenues	18,078	38,536	28,886	72,665
Operating income (loss)	(1,598)	3,440	(4,776)	6,411
Capital expenditures	1,656	16,595	3,166	34,251
Depreciation and amortization	754	753	2,114	3,946
Commercial Jet Engines and Parts | Domestic
Segment Reporting Information [Line Items]
Operating revenues	15,851	19,651	22,476	33,941
Commercial Jet Engines and Parts | International
Segment Reporting Information [Line Items]
Operating revenues	2,227	18,885	6,410	38,724
Corporate and other
Segment Reporting Information [Line Items]
Operating revenues	650	109	1,063	806
Operating income (loss)	(2,053)	(2,002)	(7,091)	(6,347)
Capital expenditures	2	213	30	285
Depreciation and amortization	77	129	326	432
Corporate and other | Domestic
Segment Reporting Information [Line Items]
Operating revenues	548	32	811	609
Corporate and other | International
Segment Reporting Information [Line Items]
Operating revenues	$ 102	$ 77	$ 252	$ 197