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Debt (Narrative) (Details)	1 Months Ended	3 Months Ended	6 Months Ended
Debt (Narrative) (Details)	Aug. 31, 2017 USD ($)	Jul. 31, 2025 USD ($)	Jul. 31, 2025 USD ($)	Apr. 09, 2025 USD ($)	Jan. 31, 2025 USD ($)	Oct. 01, 2024 USD ($)	Sep. 30, 2024 USD ($)	Jul. 31, 2024 USD ($)
Line of Credit Facility [Line Items]
Total debt		$ 4,008,000	$ 4,008,000		$ 4,136,000			$ 4,261,000
Original Mortgage Note
Line of Credit Facility [Line Items]
Face amount	$ 5,800,000
Interest rate		4.00%	4.00%
Term	20 years
Total debt		$ 4,000,000.0	$ 4,000,000.0
Amended and Restated Credit Agreement
Line of Credit Facility [Line Items]
Increase in inventory sublimit under credit agreement		35,000,000	$ 35,000,000
Line of credit facility, period for reduced borrowings during fourth quarter of each fiscal year (consecutive days)			30 days
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	$ 15,000,000
Amended and Restated Credit Agreement \| January through July
Line of Credit Facility [Line Items]
Line of credit facility, borrowing base limitation on inventory in excess of liquidation value of eligible inventory		$ 15,000,000.0	$ 15,000,000.0
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	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	$ 2,000,000
PNC \| Amended and Restated Credit Agreement
Line of Credit Facility [Line Items]
Maximum dividend amount in fiscal year		8,000,000.0	8,000,000.0			$ 8,000,000	$ 5,000,000
Line of credit facility, permitted acquisitions amount						$ 8,000,000	$ 5,000,000
PNC \| Revolving credit line
Line of Credit Facility [Line Items]
Remaining borrowing capacity		$ 68,000,000.0	$ 68,000,000.0
Unused portion fee rate		0.25%
Line of credit facility, facility fee rate						0.25%	0.375%
Share repurchase authorized amount				$ 7,500,000
PNC \| Revolving credit line \| January through July
Line of Credit Facility [Line Items]
Basis spread on variable rate			3.00%
PNC \| Revolving credit line \| 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	$ 60,000,000.0
PNC \| Revolving credit line \| Amended and Restated Credit Agreement \| June through August
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		70,000,000.0	70,000,000.0
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	$ 10,000,000.0