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Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Consolidated Statements of Stockholders' Equity        
Cash dividends declared $ 0.15 $ 0.12 $ 0.43 $ 0.36