Segment Information - Segment Data (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Operating Revenues	$ 35,604	$ 50,693	$ 72,576	$ 97,881
Operating income (loss)	(3,684)	466	(3,949)	1,465
Capital Expenditures	1,147	16,368	1,793	17,794
Depreciation and Amortization	1,149	1,695	1,758	3,635
Air Cargo
Segment Reporting Information [Line Items]
Operating Revenues	17,295	19,745	33,466	38,064
Operating income (loss)	573	254	1,127	271
Capital Expenditures	93	26	144	56
Depreciation and Amortization	19	19	35	37
Ground equipment sales
Segment Reporting Information [Line Items]
Operating Revenues	12,060	12,741	27,888	24,991
Operating income (loss)	924	1,221	3,140	2,568
Capital Expenditures	0	286	111	10
Depreciation and Amortization	46	57	114	102
Ground equipment sales | Domestic
Segment Reporting Information [Line Items]
Operating Revenues	10,996	12,102	26,807	22,961
Ground equipment sales | International
Segment Reporting Information [Line Items]
Operating Revenues	1,064	639	1,081	2,030
Commercial Jet Engines and Parts
Segment Reporting Information [Line Items]
Operating Revenues	6,114	17,801	10,808	34,128
Operating income (loss)	(2,275)	1,083	(3,177)	2,971
Capital Expenditures	1,054	16,005	1,510	17,656
Depreciation and Amortization	978	1,457	1,360	3,192
Commercial Jet Engines and Parts | Domestic
Segment Reporting Information [Line Items]
Operating Revenues	4,155	6,102	6,625	14,288
Commercial Jet Engines and Parts | International
Segment Reporting Information [Line Items]
Operating Revenues	1,959	11,699	4,183	19,840
Corporate and other
Segment Reporting Information [Line Items]
Operating Revenues	135	406	414	698
Operating income (loss)	(2,906)	(2,092)	(5,039)	(4,345)
Capital Expenditures	0	51	28	72
Depreciation and Amortization	106	162	249	304
Corporate and other | Domestic
Segment Reporting Information [Line Items]
Operating Revenues	67	332	264	556
Corporate and other | International
Segment Reporting Information [Line Items]
Operating Revenues	$ 68	$ 74	$ 150	$ 142