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Note 4 - Inventories
3 Months Ended
Sep. 30, 2011
Inventory Disclosure [Text Block]
4.   Inventories

Inventories consisted of the following:

   
September 30, 2011
   
March 31, 2011
 
 Aircraft parts and supplies
  $ 128,281     $ 139,555  
 Ground equipment manufacturing:
               
Raw materials
    7,916,624       7,918,699  
Work in process
    2,367,081       1,703,250  
Finished goods
    2,935,561       2,381,262  
 Total inventories
    13,347,547       12,142,766  
 Reserves
    (641,657 )     (604,646 )
                 
Total, net of reserves
  $ 12,705,890     $ 11,538,120