Segment Information - Segment Data (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	$ 73,300	$ 55,486	$ 171,181	$ 148,173
Overnight Air Cargo	3,720	1,865	5,185	3,677
Ground Equipment Sales	17,782	133	35,576	20,046
Printing Equipment and Maintenance	979	2,154	4,628	5,232
Corporate and other
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	415	236	1,556	601
Overnight Air Cargo	(1,558)	(1,479)	(5,418)	(5,145)
Ground Equipment Sales	213	30	285	142
Printing Equipment and Maintenance	127	149	404	445
Intercompany
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	(3,173)	18	(4,276)	0
Overnight Air Cargo	(358)	5	(219)	4
Printing Equipment and Maintenance	(1)	36	(4)	34
Air Cargo
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	18,706	17,868	56,771	52,573
Air Cargo | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	18,706	17,868	56,771	52,573
Overnight Air Cargo	610	69	874	1,324
Ground Equipment Sales	140	(3)	196	31
Printing Equipment and Maintenance	18	19	55	63
Ground equipment sales
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	15,949	16,278	40,939	35,502
Ground equipment sales | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	15,949	16,269	40,939	35,502
Overnight Air Cargo	1,644	1,173	4,213	2,264
Ground Equipment Sales	834	22	844	318
Printing Equipment and Maintenance	80	57	195	213
Ground equipment sales | Operating Segments | Domestic
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	13,505	13,022	36,466	29,384
Ground equipment sales | Operating Segments | International
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	2,444	3,247	4,473	6,118
Printing equipment and maintenance
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	82	105	396	544
Printing equipment and maintenance | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	82	105	399	544
Overnight Air Cargo	(425)	(352)	(1,262)	(1,007)
Ground Equipment Sales	0	0	0	0
Printing Equipment and Maintenance	2	(23)	32	7
Printing equipment and maintenance | Operating Segments | Domestic
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	5	80	202	274
Printing equipment and maintenance | Operating Segments | International
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	77	25	197	270
Commercial Jet Engines and Parts | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	41,321	20,990	75,792	58,953
Overnight Air Cargo	3,807	2,449	6,997	6,237
Ground Equipment Sales	16,595	84	34,251	19,555
Printing Equipment and Maintenance	753	1,916	3,946	4,470
Commercial Jet Engines and Parts | Operating Segments | Domestic
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	22,436	9,904	37,068	37,563
Commercial Jet Engines and Parts | Operating Segments | International
Segment Reporting Information [Line Items]
Operating Revenues by Segment:	$ 18,885	$ 11,086	$ 38,724	$ 21,390