Note 4 - Inventories

3 Months Ended

Jun. 30, 2011

Inventory, Policy [Policy Text Block]

4. Inventories

Inventories consisted of the following:

	June 30, 2011			March 31, 2011
Aircraft parts and supplies	$	135,222		$	139,555
Ground equipment manufacturing:
Raw materials		7,113,872			7,918,699
Work in process		4,149,207			1,703,250
Finished goods		2,359,833			2,381,262
Total inventories		13,758,134			12,142,766
Reserves		(619,646	)		(604,646	)
Total, net of reserves	$	13,138,488		$	11,538,120