Credit Agreement and Long- Term Debt - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended	42 Months Ended
	Aug. 04, 2022	Jan. 31, 2024	Apr. 27, 2024	Apr. 29, 2023	Jul. 31, 2023	Apr. 30, 2027	Aug. 03, 2022
Debt Instrument [Line Items]
Revolving loan outstanding			$ 3,400,000
Interest Expense, Debt			$ 233,000	$ 248,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Weighted average interest rate of debt outstanding			7.46%
Variable interest rate			0.50
Banc of America Leasing & Capital, LLC [Member] | Equipment Loan Agreement [Member]
Debt Instrument [Line Items]
Principal amount of debt		$ 800,000
Debt instrument, maturity date		Jan. 23, 2029
Interest rate		7.06%
Periodic payment of debt		$ 16,296
Date of first required payment		Feb. 23, 2024
LIBOR [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate			1.00%
Federal Funds Effective Swap Rate [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate			0.50%
Minimum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Commitment fee rate			0.15%
Percentage added to variable rate			0.60%
Minimum [Member] | LIBOR [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate			1.60%
Maximum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Commitment fee rate			0.35%
Percentage added to variable rate			1.50%
Maximum [Member] | LIBOR [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate			2.50%
Bank of America, N.A. [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, principal Periodic payment					$ 375,000	$ 675,000
Bank of America, N.A. [Member] | Term Loan [Member] | Second Amendment Credit Agreement [Member]
Debt Instrument [Line Items]
Proceeds from long term line of credit	$ 6,000,000
Bank of America, N.A. [Member] | Term Loan [Member] | Additional Term Loan Availed [Member] | Second Amendment Credit Agreement [Member]
Debt Instrument [Line Items]
Principal amount of debt	6,000,000
Bank of America, N.A. [Member] | Term Loan [Member] | Before Amendment To The Credit Agreement [Member]
Debt Instrument [Line Items]
Principal amount of debt	9,000,000
Bank of America, N.A. [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity			$ 21,600,000
Long term debt weighted average interest rate over a period of time			7.53%	6.93%
Bank of America, N.A. [Member] | Revolving Credit Facility [Member] | Second Amendment Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	25,000,000
Proceeds from long term line of credit	$ 12,400,000
Bank of America, N.A. [Member] | Revolving Credit Facility [Member] | Before Amendment To The Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 22,500,000
Bank of America, N.A. [Member] | Revolving Credit Facility [Member] | Other Expense [Member]
Debt Instrument [Line Items]
Interest Expense, Debt			$ 132,000	$ 292,000
Line of Credit Facility, Commitment Fee Amount			$ 11,000	$ 8,000