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Note 6 - Inventories (Tables)
 9 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31, 2015
    
March 31, 2015
  
                 
Ground support service parts
  $
1,529,931
     $
938,072
  
Printing equipment and maintenance
               
Raw materials
    
3,702,883
      
-
  
Work in process
    
354,408
      
-
  
Finished goods
    
937,166
      
-
  
Ground equipment manufacturing:
               
Raw materials
    
2,270,630
      
2,583,797
  
Work in process
    
964,274
      
1,535,152
  
Finished goods
    
2,117,512
      
3,045,761
  
Total inventories
   
11,876,804
      
8,102,782
  
Reserves
   
(319,212
 )    
(313,133
 )
Total inventories, net
   $
11,557,592
     $
7,789,649