PROPERTY, PLANT AND EQUIPMENT: (Details) - USD ($)	12 Months Ended
	Mar. 29, 2019	Mar. 30, 2018
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 12,283,808	$ 11,443,516
Less: accumulated depreciation and amortization	(9,723,201)	(9,377,361)
Property, Plant and Equipment, Net	2,560,607	2,066,155
Depreciation and amortization expense	345,840	330,037
Computers [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	502,723	496,489
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	934,648	888,488
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	6,657,876	6,189,340
Tools and dies [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,999,705	3,681,077
Furniture and fixture [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	179,072	179,072
Website development cost [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 9,784	$ 9,050