Accrued expenses and other current liabilities - (Details) - USD ($)	Mar. 31, 2019	Apr. 01, 2018
Accrued expenses and other current liabilities
Deferred Revenue	$ 1,985,700	$ 625,700
Other Accrued Expenses	666,700	771,900
Total Accrued Expenses	$ 2,652,400	$ 1,397,600