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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, 2013 32,679,642 (552,313)        
Balance at Dec. 31, 2013 $ 326,796 $ (2,234,173) $ 387,317,471 $ 87,233,820 $ (49,471) $ 472,594,443
Stock Issued During Period, Shares, New Issues 11,374,753        
Issuances of common shares $ 113,747 112,188,931 112,302,678
Issuance of restricted shares and related stock based compensation (in shares) 230,713        
Issuance of restricted shares and related stock based compensation $ 2,307 355,660 357,967
Stock repurchase (in shares) (843,022)        
Stock repurchase $ (5,307,091) (5,307,091)
Comprehensive income (loss) for the year 12,685,826 (243,549) 12,442,277
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 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 1,140,084 1,140,084
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 $ 340,377 $ 340,377