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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Stockholders' Equity [Abstract]        
Shares of common stock issued under compensation plans 152,201 249,523 567,095 902,259