Note 5 - Related Party Lease - Lease Cost (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Right-of-use operating lease assets, net	$ 254,000	$ 372,000
Operating lease obligations – long-term	0	131,000
Lease Agreement with Z3 Investment LLC [Member]
Right-of-use operating lease assets, net	3,331,000	3,550,000
Current lease liability (included in other current liabilities)	509,000	433,000
Operating lease obligations – long-term	$ 3,220,000	$ 3,495,000
Weighted average remaining lease term (Year)	4 years 3 months 18 days	4 years 9 months 18 days
Discount rate	22.00%	22.00%