Accrued expenses and other current liabilities - (Details) - USD ($)	Mar. 29, 2020	Mar. 31, 2019
Accrued expenses and other current liabilities
Deferred Revenue	$ 3,440,100	$ 1,985,700
Other Accrued Expenses	804,300	666,700
Total Accrued Expenses	4,244,400	2,652,400
Return asset	2,700,000	1,500,000
Return liability	$ 3,400,000	$ 2,000,000