Accrued expenses and other current liabilities - (Details) - USD ($)	Mar. 27, 2022	Mar. 28, 2021
Accrued expenses and other current liabilities
Allowances for product returns	$ 545,900	$ 1,967,300
Other accrued expenses	909,600	945,000
Total accrued expenses and other current liabilities	1,455,500	2,912,300
Return asset	400,000	1,000,000.0
Return liability	$ 545,900	$ 1,967,300