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Consolidated Statements of Stockholders' Equity - USD ($)
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balance (in shares) at Dec. 31, 2014 44,285,108 (1,395,335)        
Balance at Dec. 31, 2014 $ 442,850 $ (7,541,264) $ 499,862,062 $ 99,919,646 $ (293,020) $ 592,390,274
Stock based compensation 1,140,084 1,140,084
Stock repurchase (in shares) (2,372,097)        
Stock repurchase $ (12,945,608) (12,945,608)
Comprehensive income (loss) for the year 2,566,678 (100,268) 2,466,410
Balance (in shares) at Dec. 31, 2015 44,285,108 (3,767,432)        
Balance at Dec. 31, 2015 $ 442,850 $ (20,486,872) 501,002,146 102,486,324 (393,288) 583,051,160
Stock based compensation 340,377 340,377
Stock repurchase (in shares) (657,113)        
Stock repurchase $ (2,036,656) (2,036,656)
Comprehensive income (loss) for the year (7,798,300) 418,723 (7,379,577)
Balance (in shares) at Dec. 31, 2016 44,285,108 (4,424,545)        
Balance at Dec. 31, 2016 $ 442,850 $ (22,523,528) 501,342,523 94,688,024 25,435 573,975,304
Stock based compensation 129,245 129,245
Comprehensive income (loss) for the year (1,218,237) 592,460 (625,777)
Balance (in shares) at Dec. 31, 2017 44,285,108 (4,424,545)        
Balance at Dec. 31, 2017 $ 442,850 $ (22,523,528) $ 501,471,768 $ 93,469,787 $ 617,895 $ 573,478,772