Note 4 - Inventories (Detail) - Inventories Consisted of the Following: (USD $)	Dec. 31, 2012	Mar. 31, 2012
Aircraft parts and supplies	$ 119,638	$ 119,638
Ground equipment manufacturing:
Raw materials	7,219,882	9,127,113
Work in process	3,877,283	4,363,789
Finished goods	2,987,514	1,705,268
Total inventories	14,204,317	15,315,808
Reserves	(767,752)	(772,918)
Total, net of reserves	$ 13,436,565	$ 14,542,890