Note 5 - Inventories (Tables)

6 Months Ended

Sep. 30, 2015

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	September 30, 2015			March 31, 2015
Ground support service parts	$	1,378,706		$	938,072
Ground equipment manufacturing:
Raw materials		3,434,880			2,583,797
Work in process		1,711,977			1,535,152
Finished goods		3,646,024			3,045,761
Total inventories		10,171,587			8,102,782
Reserves		(270,704	)		(313,133	)
Total, net of reserves	$	9,900,883		$	7,789,649