Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)	12 Months Ended
Mar. 26, 2017	Mar. 27, 2016	Mar. 29, 2015
Allowance for doubtful accounts:
Change in valuation allowances and reserves
Balance, beginning of period	$ 841,400	$ 661,900	$ 1,080,300
Provision for bad debts	674,200	637,100	943,300
Write-offs and other adjustments	(733,400)	(457,600)	(1,361,700)
Balance, end of period	782,200	841,400	661,900
Inventory Reserve:
Change in valuation allowances and reserves
Balance, beginning of period	6,071,100	5,780,600	4,086,100
Inventory reserve expense	3,193,200	3,412,000	4,303,000
Write-offs and other adjustments	(2,903,700)	(3,121,500)	(2,608,500)
Balance, end of period	$ 6,360,600	$ 6,071,100	$ 5,780,600

Amount of increase (decrease) in the allowance for doubtful accounts.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of increase (decrease) in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from adjustments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

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- Definition

Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses.

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