Note 4 - Leases (Details Textual) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) ft²	Dec. 25, 2021 USD ($)
Norton Facility [Member]
Area of Real Estate Property (Square Foot) | ft²	38
Norton Facility [Member] | Minimum [Member]
Lessee, Operating Lease, Monthly Rent Payments		$ 13
Norton Facility [Member] | Maximum [Member]
Lessee, Operating Lease, Monthly Rent Payments		14
Facility Two [Member] | Lease Expiration, December 2020 [Member]
Operating Lease, Real Estate, Number of Leases	1
Norton Facility [Member]
Operating Lease, Expense	$ 160	$ 152