Consolidated Statements of Stockholders' Equity (unaudited) (Parentheticals) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Consolidated Statements of Stockholders' Equity (unaudited)
Shares issued under the dividend reinvestment plan (in shares)	11,423	6,442	28,687	18,347
Shares issued under the Employee Stock Purchase Plan ("ESPP") (in shares)		4,355	5,888	4,355
Purchase of treasury stock (in shares)		11,200	179,620	22,600
Stock awards granted and distributed (in shares)	5,000	1,000	95,657	80,974
Stock awards forfeited (in shares)	600	4,703	6,593	17,020
Repurchase of surrendered stock from vesting of stock plans (in shares)	1,020	480	33,322	26,346
Cash dividend declared (in dollars per share)	$ 0.24	$ 0.23	$ 0.72	$ 0.69