Income Taxes - Deferred Taxes (Details) - USD ($)	Mar. 31, 2019	Apr. 01, 2018
Deferred tax assets :
Deferred compensation	$ 267,300	$ 160,600
Accrued vacation	312,300	340,200
Deferred rent	34,500	37,200
Allowance for doubtful accounts	488,000	249,700
Inventory reserves	1,406,100	1,414,600
Sales tax reserves	192,900	217,500
Sales return assets	478,600
Other liabilities	205,700
Net operating loss	141,600
Tax contingency reserve		83,400
Other assets	652,800	1,364,900
Total gross deferred tax assets	4,179,800	3,868,100
Valuation allowance	(141,600)
Total deferred tax assets	4,038,200	3,868,100
Deferred tax liabilities :
Depreciation and amortization	(3,094,000)	(2,542,800)
Sales return liabilities	(365,200)
Prepaid expenses	(523,700)	(614,800)
Total deferred tax liabilities	(3,982,900)	(3,157,600)
Net Deferred Tax Assets	$ 55,300	$ 710,500