Summary of Significant Accounting Policies - Pronouncements adopted (Details) - USD ($)	3 Months Ended								12 Months Ended
	Apr. 01, 2018	Dec. 24, 2017	Sep. 24, 2017	Jun. 25, 2017	Mar. 26, 2017	Dec. 25, 2016	Sep. 25, 2016	Jun. 26, 2016	Apr. 01, 2018	Mar. 26, 2017	Mar. 27, 2016
Recently Issued Accounting Pronouncements
Provision for income taxes	$ (76,800)	$ 501,900	$ 1,318,300	$ 533,800	$ (895,000)	$ 843,100	$ 1,034,700	$ 58,400	$ 2,277,200	$ 1,041,200	$ 3,531,800
Effective tax rate (as a percent)									30.50%	41.90%	39.80%
Estimated forfeiture rate (as a percent)										0.00%
Internal-use computer software	$ 4,000,000				$ 4,300,000				$ 4,000,000	$ 4,300,000
Maximum
Recently Issued Accounting Pronouncements
Historical sales returns, as a percent of revenue	3.00%								3.00%
Adjustment | ASU 2016-09
Recently Issued Accounting Pronouncements
Provision for income taxes									$ 40,000
Effective tax rate (as a percent)									0.40%
Stock-based compensation (in dollars)										$ 0