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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
COMMON STOCK        
New common shares issued for exercise of stock options, shares 6,000 15,000 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 6,000 15,000 14,856 36,735
RETAINED EARNINGS        
Cash dividend declared per common share $ 0.025 $ 0.025 $ 0.050 $ 0.050