Leases - Quantitative information (Details)	3 Months Ended
Jun. 28, 2020 USD ($)
Leases
Operating lease expense	$ 871,900
Maturities of discounted lease liabilities by fiscal year are as follow:
2021	2,364,100
2022	3,164,000
2023	3,018,300
2024	2,725,700
2025	2,609,900
Thereafter	1,987,600
Total	15,869,600
Less: present value discount	(2,437,700)
Present value of lease liabilities	$ 13,431,900
Weighted-average discount rate - Operating leases	3.80%
Weighted-average remaining lease term	5 years 1 month 6 days

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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