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Consolidated Statements of Stockholders' Equity - USD ($)
Total
Capital Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive (Loss)/Income [Member]
Beginning balance at Dec. 31, 2015 $ 583,051,160 $ 442,850 $ (20,486,872) $ 501,002,146 $ 102,486,324 $ (393,288)
Balance (in shares) at Dec. 31, 2015   44,285,108 (3,767,432)      
Stock based compensation 340,377     340,377    
Stock repurchase (2,036,656)   $ (2,036,656)      
Stock repurchase (in shares)     (657,113)      
Comprehensive loss for the year (7,379,577)       (7,798,300) 418,723
Ending balance at Dec. 31, 2016 573,975,304 $ 442,850 $ (22,523,528) 501,342,523 94,688,024 25,435
Ending Balance, (in shares) at Dec. 31, 2016   44,285,108 (4,424,545)      
Stock based compensation 129,245     129,245    
Comprehensive loss for the year (625,777)       (1,218,237) 592,460
Ending balance at Dec. 31, 2017 573,478,772 $ 442,850 $ (22,523,528) 501,471,768 93,469,787 617,895
Ending Balance, (in shares) at Dec. 31, 2017   44,285,108 (4,424,545)      
Issuance of restricted shares and stock based compensation 338,356 $ 2,646   335,710    
Issuance of restricted shares and stock based compensation (in shares)   264,621        
Cumulative effect of accounting change [1] (344,181)       (344,181)  
Comprehensive loss for the year (12,220,436)       (12,276,520) 56,084
Ending balance at Dec. 31, 2018 $ 561,252,511 $ 445,496 $ (22,523,528) $ 501,807,478 $ 80,849,086 $ 673,979
Ending Balance, (in shares) at Dec. 31, 2018   44,549,729 (4,424,545)      
[1] Opening retained earnings have been adjusted on January 1, 2018 in connection with the adoption of Accounting Standard ASC 606. Please refer to Note 2 Significant Accounting Policies to the consolidated financial statements.