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Note 10 - Balance Sheet Detail (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Depreciation $ 0.1 $ 0.1 $ 0.4 $ 0.5
Accounts Receivable, Payments to be Received, Next Twelve Months 0.4   0.4  
Accounts Receivable, Payments to be Received, Two Years 0.4   0.4  
Accounts Receivable, Payments to be Received, Three Years $ 0.4   $ 0.4  
Minimum [Member]        
Payment Extension Term to Customers (Month)     12 months  
Maximum [Member]        
Payment Extension Term to Customers (Month)     36 months