Note 5 - Inventories - Inventories (Details) - USD ($)	Mar. 31, 2018	Mar. 31, 2017
Ground support service parts	$ 2,518,942	$ 2,447,395
Inventory Gross	34,789,883	22,581,199
Reserves	(558,878)	(2,802,356)
Total, net of reserves	34,231,005	19,778,843
Ground Equipment Manufacturing [Member]
Raw materials	3,314,676	1,452,201
Work in process	20,089	832,635
Finished goods	1,768,897	10,001,193
Printing Equipment and Maintenance [Member]
Raw materials	1,161,410	3,325,142
Work in process		324,949
Finished goods	553,847	790,345
Commercial Jet Engines Inventory [Member]
Inventory Gross	$ 25,452,022	$ 3,407,339

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

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