Note 4 - Leases - Costs (Details) - USD ($)	Dec. 31, 2023	Dec. 30, 2023	Dec. 31, 2022
Current lease liability	$ 160,000	$ 160,000	$ 157,000
Long-term lease liability	$ 172,000	172,000	$ 309,000
Total operating lease liability		$ 332,000
Weighted-average remaining lease term for capitalized operating leases (in months) (Year)		26 years
Weighted-average discount rate for capitalized operating leases		6.60%