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Note 4 - Other Long-term Assets (Details Textual) - USD ($)
$ in Millions
Sep. 30, 2022
Jul. 13, 2022
Dec. 31, 2021
Equity Securities without Readily Determinable Fair Value, Amount $ 25   $ 0
Wildcat Discovery Technologies [Member]      
Equity Securities without Readily Determinable Fair Value, Amount   $ 25