Note 1 - Summary of Significant Accounting Policies (Details Textual)		3 Months Ended
	Oct. 01, 2022 USD ($)	Apr. 01, 2023 USD ($) shares	Mar. 26, 2022 USD ($) shares	Dec. 31, 2022 USD ($)
Accounts Receivable, Allowance for Credit Loss		$ 200,000		$ 200,000
Capitalized Computer Software, Gross		14,000,000.0		14,700,000
Capitalized Computer Software, Amortization		$ 700,000	$ 478,000
Number of Operating Segments		3
Number of Reportable Segments		1
Goodwill and Intangible Asset Impairment, Total	$ 0
Amortization of Debt Issuance Costs		$ 49,000	100,000
Realized Gain (Loss), Foreign Currency Transaction, before Tax		$ (400,000)	$ 1,100,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares		112,000	224,000
Revenue, Remaining Performance Obligation, Amount		$ 6,600,000
Provision for Doubtful Accounts		0
Contract with Customer, Asset, after Allowance for Credit Loss, Total		0
Contract with Customer, Liability		12,000,000.0		16,100,000
Deferred Profit		5,738,000		8,022,000	[1]
Deferred Profit Long-term		5,300,000		5,500,000
Accumulated Other Comprehensive Income (Loss), Net of Tax		$ (37,009,000)		$ (40,012,000)	[1]
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Asset, Useful Life (Year)		7 years
Minimum [Member]
Standard Product Warranty Term (Month)		12 months
Maximum [Member]
Standard Product Warranty Term (Month)		36 months
Building [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		30 years
Building [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		40 years
Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		5 years
Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		15 years
Machinery, Equipment and Software [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		3 years
Machinery, Equipment and Software [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		10 years

[1] Derived from December 31, 2022 audited financial statements