Note 4 - Inventories (Tables)

3 Months Ended

Sep. 30, 2012

Schedule of Inventory, Current [Table Text Block]

	September 30, 2012			March 31, 2012
Aircraft parts and supplies	$	119,637		$	119,638
Ground equipment manufacturing:
Raw materials		8,433,365			9,127,113
Work in process		4,630,758			4,363,789
Finished goods		1,531,371			1,705,268
Total inventories		14,715,131			15,315,808
Reserves		(790,853	)		(772,918	)
Total, net of reserves	$	13,924,278		$	14,542,890