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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