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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Retained Earnings [Member]        
Cash dividend declared and paid per share (in dollars per share) $ 0.26 $ 0.24 $ 0.78 $ 0.72