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Note 6 - Dividends (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Payments of Ordinary Dividends, Common Stock $ 4,975 $ 3,311
Line Of Credit Facility Dividend Restrictions Percentage Of Net Income Limit 25.00%  
Line of Credit Facility, Waiver to Pay Dividends, Maximum $ 80,000  
Paid Quarterly [Member]    
Common Stock, Dividends, Per Share, Declared (in dollars per share) $ 0.06 $ 0.04
Payments of Ordinary Dividends, Common Stock $ 5,000