Note 5 - Inventory (Details) - USD ($)	Sep. 30, 2015	Mar. 31, 2015
Ground support service parts	$ 1,378,706	$ 938,072
Raw materials	3,434,880	2,583,797
Work in process	1,711,977	1,535,152
Finished goods	3,646,024	3,045,761
Total inventories	10,171,587	8,102,782
Reserves	(270,704)	(313,133)
Total, net of reserves	$ 9,900,883	$ 7,789,649	[1]

[1] Derived from audited financial statements