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Consolidated Statements of Shareholders' Equity (Parentheticals) - $ / shares
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Number of Shares        
Common stock dividends (in dollars per share) $ 0.15 $ 0.13 $ 0.38 $ 0.24