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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Inventory Valuation Reserves, Ending Balance	$ 748	$ 697
Impairment, Long-Lived Asset, Held-for-Use, Total		0
Research and Development Expense, Total	$ 2,000	1,500	$ 1,600
Licensing Agreements [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	17 years
Developed Technology Rights [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Trademarks [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	20 years
Noncompete Agreements [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Minimum [Member] \| Customer Lists [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	3 years
Minimum [Member] \| Patents [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Maximum [Member] \| Customer Lists [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	14 years
Maximum [Member] \| Patents [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	15 years
Building [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	20 years
Building [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	30 years
Machinery and Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
Machinery and Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	15 years
Tools, Dies and Molds [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	2 years
Tools, Dies and Molds [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
Book Overdrafts Reclassified to Accrued Liabilities [Member]
Bank Overdrafts	$ (4,700)	$ (5,000)