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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parentheticals) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Common Class A        
Dividends paid per common share (in dollars per share) $ 0.18 $ 0.16 $ 0.36 $ 0.32
Common Class B        
Dividends paid per common share (in dollars per share) $ 0.18 $ 0.16 $ 0.36 $ 0.32