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Note 2 - Summary of Significant Accounting Policies - Leases (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2019
Operating Lease, Liability $ 25 $ 100  
Operating Lease, Right-of-Use Asset $ 25 $ 110  
Accounting Standards Update 2016-02      
Operating Lease, Liability     $ 300
Operating Lease, Right-of-Use Asset     $ 300