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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Retained Earnings [Member] |  |
Common stock dividends declared, per share (in dollars per share) | $ 0.0025 | $ 0.0025
Preferred stock dividends declared, per share (in dollars per share) | $ 0.875 | $ 0.875
Additional Paid-in Capital [Member] |  |
Common stock issued for 401(k) match, shares (in shares) | 384,000 | 221,018
Common stock issued for employee incentive compensation, shares (in shares) |  | 1,237,369

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