Note 4 - Inventories (Details) - Inventory (USD $)	Sep. 30, 2013	Mar. 31, 2013
Inventory [Abstract]
Aircraft parts and supplies	$ 119,638	$ 119,638
Ground support service parts	637,207	327,753
Ground equipment manufacturing:
Raw materials	9,359,936	4,989,335
Work in process	2,063,056	1,305,029
Finished goods	1,774,688	2,230,100
Total inventories	13,954,525	8,971,855
Reserves	(828,429)	(790,155)
Total, net of reserves	$ 13,126,096	$ 8,181,700