Segment Information - Net Sales and Segment Operating Profit for Each Reporting Segment (Detail) - USD ($)	3 Months Ended
	Apr. 27, 2024	Apr. 29, 2023
Segment Reporting Information [Line Items]
Revenue	$ 32,961,000	$ 35,419,000
Corporate Expenses	3,367,000	3,126,000
Operating Income	1,346,000	1,461,000
Other Expense, net	599,000	434,000
Income Before Income Taxes	747,000	1,027,000
Income Tax Provision (Benefit)	(434,000)	179,000
Net Income	1,181,000	848,000
PI [Member]
Segment Reporting Information [Line Items]
Revenue	23,185,000	25,095,000
T&M [Member]
Segment Reporting Information [Line Items]
Revenue	9,776,000	10,324,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income	4,713,000	4,587,000
Operating Segments [Member] | PI [Member]
Segment Reporting Information [Line Items]
Operating Income	2,991,000	2,515,000
Operating Segments [Member] | T&M [Member]
Segment Reporting Information [Line Items]
Operating Income	1,722,000	2,072,000
Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Corporate Expenses	$ 3,367,000	$ 3,126,000