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Note 6 - Inventories
9 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Inventory Disclosure [Text Block]
6.
Inventories
 
Inventories consisted of the following:
 
   
December 31, 2017
   
March 31, 2017
 
Ground support service parts
  $
2,534,770
    $
2,447,395
 
Ground equipment manufacturing:
               
Raw materials
   
3,018,153
     
1,452,201
 
Work in process
   
2,203,132
     
832,635
 
Finished goods
   
2,747,129
     
10,001,193
 
Printing equipment and maintenance
               
Raw materials
   
2,737,534
     
3,325,142
 
Work in process
   
-
     
324,949
 
Finished goods
   
599,579
     
790,345
 
Commercial jet engines and parts
   
8,167,600
     
3,407,339
 
Total inventories
   
22,007,897
     
22,581,199
 
Reserves
   
(2,340,692
)    
(2,802,356
)
                 
Total, net of reserves
  $
19,667,205
    $
19,778,843