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Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Additional Paid-in Capital [Member] |  |  |
Stock issued for employee stock purchase plan, shares (in shares) |  | 13,001 | 15,735
Common Stock [Member] | Citizens National Bank [Member] |  |  |
Stock issued for acquisition, shares (in shares) |  |  | 835,741
Common Stock [Member] | Hardeman County Investment Company, Inc. [Member] |  |  |
Stock issued for acquisition, shares (in shares) |  | 799,970 |
Common Stock [Member] |  |  |
Stock issued for compensation plans, shares (in shares) | 10,109 | 122,138 | 137,706
Retained Earnings [Member] |  |  |
Cash dividends, per share (in dollars per share) | $ 0.24 | $ 0.75 | $ 0.72

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