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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Common Stock [Member]        
Restricted stock units distributed, shares (in shares) 1,164,000   1,164,000 1,079,000
Common stock issued for 401(k) match, shares (in shares) 562,000 226,000 1,307,000 778,000
Common stock issued for cash, net of offering costs, shares (in shares)   1,026,000   1,026,000
Common stock issued to directors, shares (in shares)   162,000 253,000 162,000
Common stock issued to pension plans, shares (in shares)   1,871,000 2,384,000 1,871,000
Common stock and warrants issued for purchase of another company, shares (in shares)   75,276,000   75,276,000
Common stock issued for employee incentive compensation , shares (in shares)     3,597,380 1,237,000
Retained Earnings [Member]        
Common stock dividends declared, per share (in dollars per share) $ 0.0025 $ 0.0025 $ 0.0075 $ 0.0075
Preferred stock dividends declared, per share (in dollars per share) $ 0.875 $ 0.875 $ 2.625 $ 2.625
Common stock issued for cash, net of offering costs, shares (in shares)     0