PROPERTY, PLANT AND EQUIPMENT: (Details) - USD ($)	3 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Mar. 29, 2019
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 12,544,047		$ 12,283,808
Less: accumulated depreciation and amortization	(9,959,821)		(9,723,201)
Property, Plant and Equipment, Net	2,584,226		2,560,607
Depreciation expense	236,620	$ 141,600
Computers [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	502,723		502,723
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	963,156		934,648
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	6,805,067		6,657,875
Tools and dies [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	4,084,244		3,999,705
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	$ 9,785		$ 9,785