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Note 6 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2019
Common Stock, Shares Authorized (in shares) 450,000,000 450,000,000  
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.01 $ 0.01  
Preferred Stock, Shares Authorized (in shares) 50,000,000 50,000,000  
Preferred Stock, Par or Stated Value Per Share (in dollars per share) $ 0.01 $ 0.01  
Common Stock, Shares, Outstanding (in shares) 38,702,415 37,789,131  
Preferred Stock, Shares Outstanding, Ending Balance (in shares) 0 0  
Stock Repurchase Program, Authorized Amount $ 50.0   $ 50.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 46.7