Note 4 - Inventories (Tables)

6 Months Ended

Sep. 30, 2013

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

	September 30, 2013			March 31, 2013
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