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Note 13 - Segment Information - Segment Data (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Revenues | $ 38,522,990 | $ 44,653,929 | $ 69,016,243 | $ 67,012,449
Operating Income (Loss) | 1,021,739 | 5,504,651 | (6,051,743) | 4,455,551
Capital Expenditures | 391,471 | 293,937 | 911,040 | 513,433
Depreciation and Amortization | 353,672 | 192,504 | 2,343,273 | 371,121
Corporate, Non-Segment [Member] |  |  |  |
Revenues | 281,926 | 265,838 | 563,852 | 531,047
Operating Income (Loss) | (531,696) | (66,901) | (1,463,533) | (166,931)
Capital Expenditures | 244,703 | 9,933 | 633,338 | 9,933
Depreciation and Amortization | 36,042 | 6,924 | 66,785 | 14,397
Intersegment Eliminations [Member] |  |  |  |
Revenues | (302,768) | (265,838) | (3,651,194) | (531,047)
Operating Income (Loss) | 7,199 |  | (517,790) |
Capital Expenditures |  |  | (3,066,500) |
Depreciation and Amortization | (7,199) |  | (21,550) |
Overnight Air Cargo [Member] |  |  |  |
Revenues | 17,151,214 | 17,385,753 | 33,788,379 | 30,274,943
Overnight Air Cargo [Member] | Operating Segments [Member] |  |  |  |
Revenues | 17,151,214 | 17,385,753 | 33,788,379 | 30,274,943
Operating Income (Loss) | 440,804 | 1,479,205 | 1,419,981 | 1,384,762
Capital Expenditures | 36,040 | 51,664 | 36,040 | 75,989
Depreciation and Amortization | 30,100 | 34,621 | 59,309 | 69,093
Ground Equipment Sales [Member] |  |  |  |
Revenues | 11,088,877 | 21,283,140 | 15,343,065 | 25,322,377
Ground Equipment Sales [Member] | Operating Segments [Member] |  |  |  |
Revenues | 11,088,877 | 21,283,140 | 17,759,565 | 25,322,377
Operating Income (Loss) | 1,243,037 | 4,363,084 | 1,585,357 | 3,843,913
Capital Expenditures |  | 92,969 | 19,596 | 218,739
Depreciation and Amortization | 47,326 | 103,624 | 94,920 | 199,064
Ground Equipment Sales [Member] | Operating Segments [Member] | Domestic [Member] |  |  |  |
Revenues | 10,305,102 | 20,163,034 | 15,691,171 | 22,141,063
Ground Equipment Sales [Member] | Operating Segments [Member] | International [Member] |  |  |  |
Revenues | 783,775 | 1,120,106 | 2,068,394 | 3,181,314
Ground Support Services [Member] |  |  |  |
Revenues | 7,038,151 | 5,985,036 | 13,838,193 | 11,415,129
Ground Support Services [Member] | Operating Segments [Member] |  |  |  |
Revenues | 7,038,151 | 5,985,036 | 13,838,193 | 11,415,129
Operating Income (Loss) | (240,717) | (270,737) | (350,769) | (606,193)
Capital Expenditures | 110,728 | 139,371 | 212,139 | 208,772
Depreciation and Amortization | 87,273 | 47,335 | 170,709 | 88,567
Printing Equipment and Maintenance [Member] |  |  |  |
Revenues | 1,727,896 |  | 4,287,984 |
Printing Equipment and Maintenance [Member] | Operating Segments [Member] |  |  |  |
Revenues | 1,748,738 |  | 4,958,826 |
Operating Income (Loss) | (11,851) |  | (6,947,210) |
Capital Expenditures |  |  | 9,927 |
Depreciation and Amortization | 45,803 |  | 1,726,404 |
Printing Equipment and Maintenance [Member] | Operating Segments [Member] | Domestic [Member] |  |  |  |
Revenues | 1,016,697 |  | 3,249,403 |
Printing Equipment and Maintenance [Member] | Operating Segments [Member] | International [Member] |  |  |  |
Revenues | 732,041 |  | 1,709,423 |
Commercial Jet Engines [Member] |  |  |  |
Revenues | 1,295,107 |  | 1,295,107 |
Commercial Jet Engines [Member] | Operating Segments [Member] |  |  |  |
Revenues | 1,295,107 |  | 1,295,107 |
Operating Income (Loss) | 42,806 |  | 42,806 |
Capital Expenditures |  |  |  |
Depreciation and Amortization | 28,406 |  | 28,406 |
Commercial Jet Engines [Member] | Operating Segments [Member] | Domestic [Member] |  |  |  |
Revenues | 450,188 |  | 450,188 |
Commercial Jet Engines [Member] | Operating Segments [Member] | International [Member] |  |  |  |
Revenues | 844,919 |  | 844,919 |
Leasing [Member] |  |  |  |
Revenues | 221,745 |  | 463,515 |
Depreciation and Amortization | 85,921 |  | 218,290 |
Leasing [Member] | Operating Segments [Member] |  |  |  |
Revenues | 221,745 |  | 463,515 |
Operating Income (Loss) | 72,157 |  | 179,415 |
Capital Expenditures |  |  | $ 3,066,500 |

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