Note 6 - Inventories - Inventories (Details) - USD ($)	Jun. 30, 2017	Mar. 31, 2017
Ground support service parts	$ 2,650,656	$ 2,447,395
Inventory Gross	27,953,621	22,581,199
Reserves	(2,601,245)	(2,802,356)
Total, net of reserves	25,352,376	19,778,843	[1]
Ground Equipment Manufacturing [Member]
Raw materials	2,020,072	1,452,201
Work in process	1,151,890	832,635
Finished goods	10,008,599	10,001,193
Printing Equipment and Maintenance [Member]
Raw materials	2,869,180	3,325,142
Work in process	204,022	324,949
Finished goods	790,344	790,345
Commercial Jet Engines Inventory [Member]
Inventory Gross	$ 8,258,858	$ 3,407,339

[1] Derived from audited consolidated financial statements