Note 4 - Commitments & Contingencies (Details Textual) ft² in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($) ft²	Sep. 30, 2023 USD ($) ft²
Area of Real Estate Property (Square Foot) | ft²	38	38
Norton Facility [Member]
Operating Lease, Expense	$ 41	$ 122
Minimum [Member]
Lessee, Operating Lease, Annual Rent Payments		160
Maximum [Member]
Lessee, Operating Lease, Annual Rent Payments		$ 165