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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Treasury stock, purchased at cost, shares |  | 161,554 |  |
COMMON STOCK |  |  |  |
New common shares issued for exercise of stock options, shares | 15,000 | 5,233 | 36,735 | 38,917
TREASURY STOCK |  |  |  |
Treasury stock, purchased at cost, shares |  |  | 35,962 | 273,865
CAPITAL SURPLUS |  |  |  |
New common shares issued for exercise of stock options, shares | 15,000 | 5,233 | 36,735 | 38,917
RETAINED EARNINGS |  |  |  |
Cash dividend declared per common share | $ 0.025 | $ 0.025 | $ 0.050 | $ 0.045

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