Note 7 - Inventories - Inventories (Details) - USD ($)	Mar. 31, 2019	Mar. 31, 2018
Ground support service parts	$ 2,553,949	$ 2,518,942
Inventory Gross	30,164,437	34,789,883
Reserves	(197,400)	(558,878)
Total, net of reserves	29,967,037	34,231,005
Ground Equipment Manufacturing [Member]
Raw materials	2,497,876	3,314,676
Work in process	1,659,516	20,089
Finished goods	972,542	1,768,897
Printing Equipment and Maintenance [Member]
Raw materials	401,103	1,161,410
Finished goods	1,047,893	553,847
Commercial Jet Engines Inventory [Member]
Inventory Gross	$ 21,031,558	$ 25,452,022

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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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