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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
COMMON STOCK |  |  |  |
New common shares issued for exercise of stock options, shares |  |  | 14,856 | 36,735
TREASURY STOCK |  |  |  |
Treasury stock, purchased at cost, shares |  |  |  | 35,962
CAPITAL SURPLUS |  |  |  |
New common shares issued for exercise of stock options, shares |  |  | 14,856 | 36,735
RETAINED EARNINGS |  |  |  |
Cash dividend declared per common share | $ 0.025 | $ 0.025 | $ 0.075 | $ 0.075

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