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Note 12 - Stockholders' Equity - Dividend Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Per share amount (in dollars per share) $ 0.125 $ 0.110  
Quarterly Dividends 1 [Member]      
Payment date Mar. 24, 2022   Dec. 02, 2021
Per share amount (in dollars per share) $ 0.125   $ 0.110
Dividend payment $ 2,743   $ 2,405
Quarterly Dividends 2 [Member]      
Payment date     Mar. 25, 2021
Per share amount (in dollars per share)     $ 0.110
Dividend payment     $ 2,262
Quarterly Dividends 3 [Member]      
Payment date     Jun. 03, 2021
Per share amount (in dollars per share)     $ 0.110
Dividend payment     $ 2,267
Quarterly Dividends 4 [Member]      
Payment date     Sep. 09, 2021
Per share amount (in dollars per share)     $ 0.110
Dividend payment     $ 2,401