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Note 6 - Inventories (Tables)
9 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31, 2016
   
March 31, 2016
 
Ground support service parts
  $
2,498,473
    $
1,566,694
 
Ground equipment manufacturing:
               
Raw materials
   
2,018,052
     
1,549,810
 
Work in process
   
1,692,322
     
408,213
 
Finished goods
   
9,396,326
     
4,328,812
 
Printing equipment and maintenance
               
Raw materials
   
2,326,857
     
3,319,939
 
Work in process
   
322,537
     
759,446
 
Finished goods
   
1,090,370
     
562,912
 
Commercial jet engines
   
3,580,930
     
-
 
Total inventories
   
22,925,867
     
12,495,826
 
Reserves
   
(1,979,147
)
   
(221,722
)
                 
Total, net of reserves
  $
20,946,720
    $
12,274,104