Note 6 - Inventories - Inventories (Details) - USD ($)	Sep. 30, 2017	Mar. 31, 2017
Ground support service parts	$ 2,661,735	$ 2,447,395
Inventory Gross	20,564,589	22,581,199
Reserves	(2,432,855)	(2,802,356)
Total, net of reserves	18,131,734	19,778,843	[1]
Ground Equipment Manufacturing [Member]
Raw materials	3,587,397	1,452,201
Work in process	1,822,043	832,635
Finished goods	3,739,160	10,001,193
Printing Equipment and Maintenance [Member]
Raw materials	2,700,219	3,325,142
Work in process		324,949
Finished goods	790,344	790,345
Commercial Jet Engines Inventory [Member]
Inventory Gross	$ 5,263,691	$ 3,407,339

[1] Derived from audited consolidated financial statements