Annual report pursuant to Section 13 and 15(d)

Note 9 - Stockholders' Equity - Dividend Activity (Details)

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Note 9 - Stockholders' Equity - Dividend Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dividends per share (in dollars per share) $ 0.20 $ 0.20 $ 0.20 $ 0.20   $ 0.64
Dividends         $ 9,138 $ 7,344
Special Dividends Declared October 29, 2019 [Member]            
Dividends per share (in dollars per share)           $ 0.40
Dividends           $ 4,608
Special Dividends Declared January 27, 2019 [Member]            
Dividends per share (in dollars per share)           $ 0.08
Dividends           $ 912
Dividends Declared January 27, 2019 [Member]            
Dividends per share (in dollars per share)           $ 0.16
Dividends           $ 1,824