Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Summary of Significant Accounting Policies (Details Textual)

v3.23.2
Note 2 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Number of Operating Segments     1    
Revenue from Contract with Customer, Excluding Assessed Tax $ 0 $ 4 $ 0 $ 4  
Accounts Receivable, after Allowance for Credit Loss, Current, Total 104   104   $ 12
Trade Accounts Receivable [Member]          
Accounts Receivable, after Allowance for Credit Loss, Current, Total 0   0   $ 0
Sale of Inventory [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax $ 0 $ 0 $ 0 $ 0