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Note 5 - Leases - Maturity of Operating Lease (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
2021 (remaining) $ 115  
2022 690  
2023 0  
2024 0  
2025 0  
Thereafter 0  
Total undiscounted lease payments 805  
Discount to present value (57)  
Present value of lease liabilities $ 748 $ 432
Weighted average remaining lease term - years (Year) 1 year 2 months 12 days  
Weighted average discount rate - percent 12.00%