Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Apr. 01, 2018	Mar. 26, 2017
Allowance for doubtful accounts:
Change in valuation allowances and reserves
Balance, beginning of period	$ 1,094,900	$ 782,200	$ 841,400
Provision/expense	1,721,200	797,100	674,200
Write-offs and other adjustments	(678,200)	(484,400)	(733,400)
Balance, end of period	2,137,900	1,094,900	782,200
Inventory Reserve:
Change in valuation allowances and reserves
Balance, beginning of period	5,739,700	6,360,600	6,071,100
Provision/expense	4,863,100	4,361,400	3,193,200
Write-offs and other adjustments	(4,732,200)	(4,982,300)	(2,903,700)
Balance, end of period	5,870,600	$ 5,739,700	$ 6,360,600
Allowance for deferred tax asset:
Change in valuation allowances and reserves
Provision/expense	141,600
Balance, end of period	$ 141,600