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Note 8 - Leases - Maturity of Operating Lease Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
2022 (remaining nine months) $ 212  
2023 287  
2024 67  
Total lease payments 566  
Less: Amount representing interest (67)  
Accrued Liabilities and Other Noncurrent Liabilities [Member]    
Present value of lease liabilities $ 499 $ 552