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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
Common Stock
Treasury Stock
Additional Paid-In Capital
Retained Earnings Unappropriated
Retained Earnings Appropriated
Accumulated Other Comprehensive Income (Loss)
Total
Shares issued at Dec. 31, 2017 9,410,588            
Balance, shares at Dec. 31, 2017 9,360,758 49,830          
Balance, amount at Dec. 31, 2017 $ 23,525 $ (554,870) $ 94,524,608 $ 255,572,431 $ 24,233,544 $ 8,162,958 $ 381,962,196
Translation adjustment           (18,641,006) (18,641,006)
Issuance of stock options to employees and directors     496,200       496,200
Net loss (69,963,986) (69,963,986)
Shares issued at Dec. 31, 2018 9,410,588            
Balance, shares at Dec. 31, 2018 9,360,758 49,830          
Balance, amount at Dec. 31, 2018 $ 23,525 $ (554,870) 95,020,808 185,608,445 24,233,544 (10,478,048) 293,853,404
Translation adjustment           (5,013,759) (5,013,759)
Shares issued from treasury stock for services, shares 4,000 (4,000)          
Shares issued from treasury stock for services, amount   $ 44,541 (22,941)       21,600
Cashless exercise of stock options, shares issued 151,856            
Cashless exercise of stock options, shares outstanding 151,856            
Cashless exercise of stock options, amount $ 379   (379)       0
Issuance of stock options to employees and directors     45,900       45,900
Net loss (25,800,045) (25,800,045)
Shares issued at Dec. 31, 2019 9,562,444            
Balance, shares at Dec. 31, 2019 9,516,614 45,830          
Balance, amount at Dec. 31, 2019 $ 23,904 $ (510,329) $ 95,043,388 $ 159,808,400 $ 24,233,544 $ (15,491,807) $ 263,107,100