Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock issued to directors, shares (in shares)	207,000	391,000	253,000
Common stock issued for cash, shares (in shares)			21,410,000
Common stock issued for 401(k) match, shares (in shares)	685,000	1,584,000	1,882,000
Common stock issued for prepayment of debt , shares (in shares)			10,655,000
Common stock dividends declared, per common share (in dollars per share)	$ 0.0375	$ 0.01625	$ 0.01
Preferred stock dividends declared, per share (in dollars per share)	$ 2.63	$ 2.63	$ 2.63
Common stock issued for employee incentive compensation, shares (in shares)		2,800,000	3,597,000
Common stock issued to pension plans, shares (in shares)	4,500,000	2,869,000	2,384,000
Restricted stock unit distributions, shares (in shares)	1,653,000	1,702,000	1,164,000
Treasury shares issued to charitable foundation, shares (in shares)		650,000