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Note 1 - Organization, Business and Financial Condition (Details)
$ in Thousands
Apr. 27, 2021
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Retained earnings (Accumulated deficit), ending balance   $ 101,200    
Cash and cash equivalents, at carrying value, ending balance   $ 4,980 $ 10,495 $ 12,653
Reverse Stock Split [Member]        
Stockholders' equity note, stock split, conversion ratio 6      
Merger Agreement with Leading Biosciences, Inc. [Member]        
Merger agreement, exchange ratio 0.02719