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Note 7 - Stockholders' Equity - Common Share Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 01, 2022
Sep. 01, 2022
Jun. 01, 2022
Mar. 01, 2022
Dec. 01, 2021
Sep. 01, 2021
Jun. 01, 2021
Mar. 01, 2021
Dec. 31, 2022
Dec. 31, 2021
Dividend (in dollars per share) $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.05    
Total paid $ 833 $ 829 $ 827 $ 822 $ 822 $ 822 $ 817 $ 680 $ 3,311 $ 3,141