SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Schedule of Basic and Diluted Income Per Share) (Details) - USD ($)	3 Months Ended
	Jun. 28, 2019	Jun. 29, 2018
Accounting Policies [Abstract]
NET INCOME	$ 909,533	$ 2,259,285
BASIC EARNINGS PER COMMON SHARE	$ 0.39	$ .98
FULLY DILUTED EARNINGS PER SHARE	$ 0.37	$ 0.95
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING - BASIC	2,323,000	2,315,000
DILUTIVE EFFECT OF OPTIONS GRANTED	116,210	67,539
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING - FULLY DILUTED	2,440,000	2,382,000