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Note 4 - Inventories
3 Months Ended
Sep. 30, 2012
Inventory Disclosure [Text Block]
4.     Inventories

Inventories consisted of the following:

   
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