Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Stockholders' Equity (Details Textual)

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Note 9 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Jan. 12, 2016
Jul. 28, 2015
Common Stock, Dividends, Per Share, Declared (in dollars per share) $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20    
Dividends, Common Stock             $ 6.9 $ 6.9    
Stock Repurchase Program, Authorized Amount                 $ 70.0 $ 15.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 21.9           $ 21.9