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Note 16 - Segment Information (Tables)
6 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended September 30,
   
Six Months Ended September 30,
 
   
2018
   
2017
   
2018
   
2017
 
Operating Revenues by Segment:
                               
Overnight Air Cargo
  $
17,064,600
    $
18,081,073
    $
34,705,258
    $
34,823,248
 
Ground Equipment Sales:
                               
Domestic
   
11,069,537
     
15,046,892
     
16,361,554
     
20,323,258
 
International
   
1,775,983
     
469,217
     
2,871,080
     
1,142,507
 
Total Ground Equipment Sales
   
12,845,520
     
15,516,109
     
19,232,634
     
21,465,765
 
Ground Support Services
   
8,474,037
     
8,801,326
     
17,521,677
     
17,914,399
 
Printing Equipment and Maintenance
                               
Domestic
   
2,824
     
280,328
     
193,726
     
1,724,310
 
International
   
137,121
     
1,022,594
     
245,042
     
2,709,993
 
Total Printing Equipment and Maintenance
   
139,945
     
1,302,922
     
438,768
     
4,434,303
 
Commercial Jet Engines and Parts:
                               
Domestic
   
5,341,234
     
2,275,190
     
27,659,269
     
10,466,075
 
International
   
5,301,557
     
2,851,729
     
10,303,697
     
7,387,185
 
Total Commercial Jet Engines and Parts
   
10,642,791
     
5,126,919
     
37,962,966
     
17,853,260
 
Corporate
   
189,297
     
325,349
     
364,689
     
651,628
 
Intercompany
   
(15,412
)    
(292,208
)    
(17,746
)    
(583,740
)
Total
  $
49,340,777
    $
48,861,490
    $
110,208,246
    $
96,558,863
 
                                 
Operating Income (Loss):
                               
Overnight Air Cargo
  $
197,870
    $
896,506
    $
1,254,562
    $
1,713,172
 
Ground Equipment Sales
   
697,557
     
1,165,430
     
1,091,057
     
1,331,224
 
Ground Support Services
   
(742,482
)    
276,113
     
(830,206
)    
632,937
 
Printing Equipment and Maintenance
   
(413,298
)    
(482,222
)    
(654,368
)    
441,814
 
Commercial Jet Engines and Parts
   
574,974
     
(48,760
)    
3,788,153
     
762,180
 
Corporate
   
(1,934,819
)    
(1,381,192
)    
(3,665,694
)    
(2,244,210
)
Intercompany
   
198
     
49,783
     
198
     
51,109
 
Total
  $
(1,620,001
)   $
475,658
    $
983,701
    $
2,688,226
 
                                 
Capital Expenditures:
                               
Overnight Air Cargo
  $
28,460
    $
20,346
    $
34,456
    $
20,346
 
Ground Equipment Sales
   
156,230
     
2,258
     
296,320
     
2,258
 
Ground Support Services
   
8,062
     
117,919
     
60,500
     
143,284
 
Printing Equipment and Maintenance
   
-
     
8,491
     
-
     
8,491
 
Commercial Jet Engines and Parts
   
19,286,871
     
7,078,004
     
19,470,692
     
7,082,981
 
Corporate
   
34,010
     
542,202
     
111,240
     
1,001,855
 
Total
  $
19,513,634
    $
7,769,220
    $
19,973,209
    $
8,259,215
 
                                 
Depreciation, Amortization and Impairment:
                               
Overnight Air Cargo
  $
21,178
    $
30,128
    $
43,941
    $
61,144
 
Ground Equipment Sales
   
65,384
     
117,499
     
156,733
     
250,379
 
Ground Support Services
   
119,816
     
113,625
     
244,871
     
225,256
 
Printing Equipment and Maintenance
   
15,307
     
3,316
     
29,638
     
8,007
 
Commercial Jet Engines and Parts
   
1,456,129
     
151,338
     
2,554,062
     
197,114
 
Corporate
   
150,416
     
114,956
     
295,711
     
189,115
 
Intercompany
   
(1,324
)    
(1,324
)    
(2,649
)    
(2,650
)
Total
  $
1,826,905
    $
529,538
    $
3,322,306
    $
928,365