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Commitments and Contingencies (Details) - USD ($)
12 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Mar. 26, 2017
Commitments and contingencies      
Rent expense $ 3,001,800 $ 3,041,700 $ 3,047,500
Minimum future obligations      
2020 2,996,700    
2021 2,111,600    
2022 203,200    
2023 14,900    
Total 5,326,400    
Leased office space in Timonium, Maryland | Minimum      
Commitments and contingencies      
Base rental rate per month 174,500    
Leased office space in Timonium, Maryland | Maximum      
Commitments and contingencies      
Base rental rate per month 185,100    
Leased office and warehouse space in Hunt Valley, Maryland | Minimum      
Commitments and contingencies      
Base rental rate per month 38,200    
Leased office and warehouse space in Hunt Valley, Maryland | Maximum      
Commitments and contingencies      
Base rental rate per month 39,300    
Leased office and warehouse space in San Antonio, Texas | Minimum      
Commitments and contingencies      
Base rental rate per month 18,000    
Leased office and warehouse space in San Antonio, Texas | Maximum      
Commitments and contingencies      
Base rental rate per month $ 19,100