Inventories - Inventories (Details) - USD ($)	Jun. 30, 2019	Mar. 31, 2019
Inventory [Line Items]
Ground support service parts	$ 2,580,196	$ 2,553,949
Printing equipment and maintenance
Commercial jet engines and parts	27,691,133	21,031,558
Total inventories	36,722,092	30,164,437
Reserves	(193,315)	(197,400)
Total inventories, net of reserves	36,528,777	29,967,037
Ground equipment manufacturing:
Ground equipment manufacturing:
Raw materials	3,017,469	2,497,876
Work in process	1,351,370	1,659,516
Finished goods	643,763	972,542
Printing equipment and maintenance
Raw materials	3,017,469	2,497,876
Finished goods	643,763	972,542
Printing equipment and maintenance
Ground equipment manufacturing:
Raw materials	0	401,103
Finished goods	1,438,161	1,047,893
Printing equipment and maintenance
Raw materials	0	401,103
Finished goods	$ 1,438,161	$ 1,047,893

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Inventory for ground support services parts

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Gross amount, as of the balance sheet date, of plant or equipment components to be used for the primary purpose of air transportation.

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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