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Note 11 - Shareholders' Equity (Details Textual) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Common Stock, Dividends, Per Share, Declared $ 0.13 $ 0.12 $ 0.12 $ 0.12 $ 0.37 $ 0.12