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Note 6 - Inventories - Inventories (Details) - USD ($) | Jun. 30, 2017 | Mar. 31, 2017
--- | --- | ---
Ground support service parts | $ 2,650,656 | $ 2,447,395 |
Inventory Gross | 27,953,621 | 22,581,199 |
Reserves | (2,601,245) | (2,802,356) |
Total, net of reserves | 25,352,376 | 19,778,843 | [1]
Ground Equipment Manufacturing [Member] |  |  |
Raw materials | 2,020,072 | 1,452,201 |
Work in process | 1,151,890 | 832,635 |
Finished goods | 10,008,599 | 10,001,193 |
Printing Equipment and Maintenance [Member] |  |  |
Raw materials | 2,869,180 | 3,325,142 |
Work in process | 204,022 | 324,949 |
Finished goods | 790,344 | 790,345 |
Commercial Jet Engines Inventory [Member] |  |  |
Inventory Gross | $ 8,258,858 | $ 3,407,339 |
[1] | Derived from audited consolidated financial statements

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