Debt (Narrative) (Details)	1 Months Ended	6 Months Ended
	Aug. 31, 2017 USD ($)	Jul. 31, 2024 USD ($)	Jun. 01, 2024 USD ($)	Apr. 29, 2024 USD ($)	Apr. 28, 2024 USD ($)	Jan. 31, 2024 USD ($)	Jul. 31, 2023 USD ($)
Line of Credit Facility [Line Items]
Unused portion fee rate		0.375%
Long-term debt		$ 4,261,000				$ 4,384,000	$ 46,517,000
Original Mortgage Note
Line of Credit Facility [Line Items]
Interest rate	4.00%
Long-term debt		4,300,000
Face amount	$ 5,800,000
Term	20 years
Amended and Restated Credit Agreement
Line of Credit Facility [Line Items]
Line of credit facility, term		$ 15,000,000.0
Line of credit facility, period for reduced borrowings during fourth quarter of each fiscal year (consecutive days)		30 days
Increase in inventory sublimit under credit agreement				$ 35,000,000
Amended and Restated Credit Agreement | In Effect May Through August 2024
Line of Credit Facility [Line Items]
Increase in assemble to ship inventory sublimit under credit agreement				$ 15,000,000
Amended and Restated Credit Agreement | Consecutive Four Fiscal Quarters Ending July 31, 2020
Line of Credit Facility [Line Items]
Minimum fixed charge coverage ratio				1.20
Amended and Restated Credit Agreement | Inventory
Line of Credit Facility [Line Items]
Revolving credit facility borrowing base limitation		60.00%
Amended and Restated Credit Agreement | Inventories
Line of Credit Facility [Line Items]
Revolving credit facility borrowing base limitation		85.00%
Amended and Restated Credit Agreement | Maximum | Accounts receivable
Line of Credit Facility [Line Items]
Revolving credit facility borrowing base limitation		85.00%
Equipment Loan | Amended and Restated Credit Agreement
Line of Credit Facility [Line Items]
Line of credit facility, equipment financing		$ 2,000,000
PNC | Amended and Restated Credit Agreement
Line of Credit Facility [Line Items]
Maximum dividend amount in fiscal year				$ 5,000,000.0	$ 3,000,000.0
PNC | Revolving credit line
Line of Credit Facility [Line Items]
Remaining borrowing capacity		$ 68,000,000.0
PNC | Revolving credit line | Secured Overnight Financing Rate (SOFR) | January through July
Line of Credit Facility [Line Items]
Basis spread on variable rate		3.00%
PNC | Revolving credit line | Secured Overnight Financing Rate (SOFR) | August through December
Line of Credit Facility [Line Items]
Basis spread on variable rate		2.50%
PNC | Revolving credit line | Amended and Restated Credit Agreement
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 60,000,000.0	$ 70,000,000.0	$ 70,000,000	$ 72,500,000
PNC | Equipment Loan | Amended and Restated Credit Agreement
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 10,000,000.0