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Note 6 - Inventories
6 Months Ended
Sep. 30, 2017
Notes to Financial Statements  
Inventory Disclosure [Text Block]
6.
Inventories
 
Inventories consisted of the following:
 
   
September 30, 2017
   
March 31, 2017
 
Ground support service parts
  $
2,661,735
    $
2,447,395
 
Ground equipment manufacturing:
               
Raw materials
   
3,587,397
     
1,452,201
 
Work in process
   
1,822,043
     
832,635
 
Finished goods
   
3,739,160
     
10,001,193
 
Printing equipment and maintenance
               
Raw materials
   
2,700,219
     
3,325,142
 
Work in process
   
-
     
324,949
 
Finished goods
   
790,344
     
790,345
 
Commercial jet engines and parts
   
5,263,691
     
3,407,339
 
Total inventories
   
20,564,589
     
22,581,199
 
Reserves
   
(2,432,855
)    
(2,802,356
)
                 
Total, net of reserves
  $
18,131,734
    $
19,778,843