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Note 7 - Stockholders' Equity - Schedule of Stock by Class (Details) - shares
shares in Thousands
Dec. 31, 2023
Dec. 31, 2022
Series B Preferred Stock, Authorized (in shares) 65,000  
Series B Preferred Stock, Shares Issued (in shares) 0 1,270
Series B Preferred Stock [Member]    
Series B Preferred Stock, Authorized (in shares) 7,235  
Series B Preferred Stock, Shares Issued (in shares) 0 1,270
Undesignated [Member]    
Series B Preferred Stock, Authorized (in shares) 57,765  
Series B Preferred Stock, Shares Issued (in shares) 0 0