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Note 7 - Inventories (Tables)
6 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30, 2016
   
March 31, 2016
 
Ground support service parts
  $ 2,282,627     $ 1,566,694  
Ground equipment manufacturing:
               
Raw materials
    2,397,974       1,549,810  
Work in process
    1,002,710       408,213  
Finished goods
    7,723,641       4,328,812  
Printing equipment and maintenance
               
Raw materials
    3,219,663       3,319,939  
Work in process
    798,031       759,446  
Finished goods
    901,769       562,912  
Commercial jet engines
    2,003,484       -  
Total inventories
    20,329,899       12,495,826  
Reserves
    (2,662,498 )     (221,722 )
                 
Total, net of reserves
  $ 17,667,401     $ 12,274,104