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Note 4 - Inventories (Tables)
 12 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
Year Ended March 31,
  
   
2017
    
2016
  
Ground support service parts
  $
2,447,395
     $
1,566,694
  
Ground equipment manufacturing:
               
Raw materials
    
1,452,201
      
1,549,810
  
Work in process
    
832,635
      
408,213
  
Finished goods
    
10,001,193
      
4,328,812
  
Printing equipment and maintenance:
                
Raw materials
    
3,325,142
      
3,319,939
  
Work in process
    
324,949
      
759,446
  
Finished goods
    
790,345
      
562,912
  
Commercial jet engines and parts
   
3,407,339
      
-
  
Total inventories
   
22,581,199
      
12,495,826
  
Reserves
   
(2,802,356
 )    
(221,722
 )
                 
Total, net of reserves
   $
19,778,843
     $
12,274,104