Note 6 - Inventories - Inventories (Details) - USD ($)	Dec. 31, 2017	Mar. 31, 2017
Ground support service parts	$ 2,534,770	$ 2,447,395
Inventory Gross	22,007,897	22,581,199
Reserves	(2,340,692)	(2,802,356)
Total, net of reserves	19,667,205	19,778,843	[1]
Ground Equipment Manufacturing [Member]
Raw materials	3,018,153	1,452,201
Work in process	2,203,132	832,635
Finished goods	2,747,129	10,001,193
Printing Equipment and Maintenance [Member]
Raw materials	2,737,534	3,325,142
Work in process		324,949
Finished goods	599,579	790,345
Commercial Jet Engines Inventory [Member]
Inventory Gross	$ 8,167,600	$ 3,407,339

[1] Derived from audited consolidated financial statements