REVENUE FROM MAJOR CUSTOMERS: (Narrative) (Details) - USD ($)	3 Months Ended			6 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018
Revenue derived from customers	$ 7,551,384		$ 6,597,876	$ 15,118,782	$ 15,641,182
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Concentration risk	30.00%			38.00%	39.00%
Revenue derived from customers	$ 2,247,968	$ 1,065,411		$ 5,729,924	$ 6,096,486
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Major Customer One [Member]
Concentration risk	16.00%	16.00%		16.00%	15.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Major Customer Two [Member]
Concentration risk	14.00%			12.00%	12.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Major Customer Three [Member]
Concentration risk				10.00%