Income Taxes - Reconciliation. Provision and Deferred Taxes (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 27, 2016	Dec. 27, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 28, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 27, 2016	Mar. 29, 2015	Mar. 30, 2014
Effective income tax rate reconciliation
Statutory federal rate (as a percent)									34.00%	34.20%	35.00%
State taxes, net of federal benefit (as a percent)									4.50%	4.10%	3.30%
Non-deductible expenses (as a percent)									2.10%	0.90%	0.70%
Other (as a percent)									(0.80%)		(0.80%)
Effective rate (as a percent)									39.80%	39.20%	38.20%
Federal
Current									$ 2,350,000	$ 3,035,400	$ 9,252,700
Deferred									763,100	1,964,800	(396,600)
State
Current									345,100	398,500	1,212,400
Deferred									73,600	178,100	(5,400)
Provision for income taxes	$ (1,205,800)	$ 1,768,800	$ 1,850,900	$ 1,117,900	$ (41,000)	$ 941,600	$ 2,303,600	$ 2,372,600	3,531,800	5,576,800	$ 10,063,100
Net deferred tax assets (liabilities)
Deferred compensation	357,500				802,700				357,500	802,700
Accrued vacation	534,200				554,100				534,200	554,100
Deferred rent	459,100				687,500				459,100	687,500
Allowance for doubtful accounts	266,300				232,800				266,300	232,800
Inventory reserves	2,264,500				2,175,500				2,264,500	2,175,500
Sales tax reserves	366,500				459,600				366,500	459,600
Other assets	475,200				516,000				475,200	516,000
Restricted Stock					89,600					89,600
Tax contingency reserve	247,600				286,200				247,600	286,200
Depreciation and amortization	(3,646,200)				(3,354,600)				(3,646,200)	(3,354,600)
Other liabilities	(374,100)				(312,400)				(374,100)	(312,400)
Accrued compensation	(577,600)				(873,700)				(577,600)	(873,700)
Prepaid expenses	(752,400)				(767,400)				(752,400)	(767,400)
Net Deferred Tax (Liability)	(379,400)								(379,400)
Net Deferred Tax Asset					495,900					495,900
Valuation allowance	$ 0				$ 0				$ 0	$ 0