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Note 4 - Inventories (Tables)
9 Months Ended
Dec. 31, 2012
Schedule of Inventory, Current [Table Text Block]
   
December 31, 2012
   
March 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