SEGMENT INFORMATION (PRODUCT) (Details)		12 Months Ended
		Apr. 30, 2016 USD ($) segment	Apr. 30, 2015 USD ($)
Revenue from External Customer
Net sales		$ 16,194,000	$ 13,562,000
Segment Information
Number of operating segments | segment		1
Number of reportable segments | segment		1
Magnetic components
Revenue from External Customer
Net sales		$ 8,339,000	6,247,000
Potted coil assembly
Revenue from External Customer
Net sales		4,989,000	4,827,000
Electro-mechanical assemblies
Revenue from External Customer
Net sales		2,716,000	2,310,000
Large Transformers
Revenue from External Customer
Net sales		149,000	173,000
Total Torotel products
Revenue from External Customer
Net sales		16,193,000	13,557,000
Electronika
Revenue from External Customer
Net sales	[1]	$ 1,000	$ 5,000

[1] Electronika was dissolved on February 8, 2016 and its affairs wound up.