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Note 4 - Inventories - Inventories (Details) - USD ($)
Mar. 31, 2017
Mar. 31, 2016
Ground support service parts $ 2,447,395 $ 1,566,694
Inventory Gross 22,581,199 12,495,826
Reserves (2,802,356) (221,722)
Total, net of reserves 19,778,843 12,274,104
Ground Equipment Manufacturing [Member]    
Raw materials 1,452,201 1,549,810
Work in process 832,635 408,213
Finished goods 10,001,193 4,328,812
Printing Equipment and Maintenance [Member]    
Raw materials 3,325,142 3,319,939
Work in process 324,949 759,446
Finished goods 790,345 562,912
Commercial Jet Engines Inventory [Member]    
Inventory Gross $ 3,407,339