PROPERTY, PLANT AND EQUIPMENT: (Details) - USD ($)	Mar. 30, 2018	Mar. 31, 2017
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 11,443,516	$ 11,066,474
Less: accumulated depreciation and amortization	(9,377,361)	(9,047,324)
PROPERTY, PLANT AND EQUIPMENT, NET	2,066,155	2,019,150
Computers [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	496,489	444,184
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	888,488	878,888
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	6,189,340	6,079,401
Tools and dies [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,681,077	3,484,307
Furniture and fixture [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	179,072	170,644
Website development cost [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 9,050	$ 9,050