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Consolidated Statements of Stockholders' Equity - USD ($)
Total
Restatement Adjustment [Member]
Capital Stock [Member]
Capital Stock [Member]
Restatement Adjustment [Member]
Treasury Stock [Member]
Treasury Stock [Member]
Restatement Adjustment [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Restatement Adjustment [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Restatement Adjustment [Member]
Accumulated Other Comprehensive (Loss)/Income [Member]
Accumulated Other Comprehensive (Loss)/Income [Member]
Restatement Adjustment [Member]
Beginning balance at Dec. 31, 2017 $ 573,478,772 $ 573,134,591 $ 442,850 $ 442,850 $ (22,523,528) $ (22,523,528) $ 501,471,768 $ 501,471,768 $ 93,469,787 $ 93,125,606 $ 617,895 $ 617,895
Balance (in shares) at Dec. 31, 2017     44,285,108 44,285,108 (4,424,545) (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 (344,181)               (344,181)      
Comprehensive income/(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)              
Stock based compensation 611,644           611,644          
Stock repurchase (1,837,617)       $ (1,837,617)              
Stock repurchase (in shares)         (540,910)              
Comprehensive income/(loss) for the year (839,898)               2,093,124   (2,933,022)  
Ending balance at Dec. 31, 2019 559,186,640   $ 445,496   $ (24,361,145)   502,419,122   82,942,210   (2,259,043)  
Ending Balance, (in shares) at Dec. 31, 2019     44,549,729   (4,965,455)              
Stock repurchase (1,012,235)       $ (1,012,235)              
Stock repurchase (in shares)         (359,792)              
Stock repurchase and cancellation (2,868,695)   $ (13,660)       (2,855,035)          
Stock repurchase and cancellation (in shares)     (1,366,045)                  
Comprehensive income/(loss) for the year 9,290,705               11,984,485   (2,693,780)  
Ending balance at Dec. 31, 2020 $ 564,596,415   $ 431,836   $ (25,373,380)   $ 499,564,087   $ 94,926,695   $ (4,952,823)  
Ending Balance, (in shares) at Dec. 31, 2020     43,183,684   (5,325,247)