Note 5 - Related Party Lease - Lease Cost (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Right-of-use operating lease assets, net	$ 50,000	$ 122,000
Operating lease obligations – related party – long-term	2,720,000	2,900,000
Lease Agreement with Z3 Investment LLC [Member]
Right-of-use operating lease assets, net	2,956,000	3,088,000
Current lease liability (included in other current liabilities)	641,000	595,000
Operating lease obligations – related party – long-term	$ 2,720,000	$ 2,900,000
Weighted average remaining lease term (Year)	3 years 6 months	3 years 9 months 18 days
Discount rate	22.00%	22.00%