Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)	12 Months Ended
	Mar. 27, 2016	Mar. 29, 2015	Mar. 30, 2014
Allowance for doubtful accounts:
Change in valuation allowances and reserves
Balance, beginning of period	$ 661,900	$ 1,080,300	$ 1,274,700
Provision for bad debts	637,100	943,300	202,000
Write-offs and other adjustments	(457,600)	(1,361,700)	(396,400)
Balance, end of period	841,400	661,900	1,080,300
Inventory Reserve:
Change in valuation allowances and reserves
Balance, beginning of period	5,780,600	4,086,100	3,336,700
Inventory reserve expense	3,412,000	4,303,000	2,917,200
Write-offs and other adjustments	(3,121,500)	(2,608,500)	(2,167,800)
Balance, end of period	$ 6,071,100	$ 5,780,600	$ 4,086,100