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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 at Dec. 31, 2012 $ 211,796 $ (2,234,173) $ 278,020,814 $ 66,016,627 $ 18,378 $ 342,033,442
Balance (in Shares) at Dec. 31, 2012 21,179,642 (552,313)        
Follow-on public offering net of issuance cost $ 115,000   109,004,029     $ 109,119,029
Follow-on public offering net of issuance cost (in Shares) 11,500,000          
Stock repurchase (in Shares)           0
Stock based compensation     292,628     $ 292,628
Comprehensive income for the year       21,217,193 (67,849) 21,149,344
Balance at Dec. 31, 2013 $ 326,796 $ (2,234,173) 387,317,471 87,233,820 (49,471) 472,594,443
Balance (in Shares) at Dec. 31, 2013 32,679,642 (552,313)        
Follow-on public offering net of issuance cost $ 113,747   112,188,931     112,302,678
Follow-on public offering net of issuance cost (in Shares) 11,374,753          
Issuance of restricted shares and related stock based compensation $ 2,307   355,660     357,967
Issuance of restricted shares and related stock based compensation (in Shares) 230,713          
Stock repurchase   $ (5,307,091)       $ (5,307,091)
Stock repurchase (in Shares)   (843,022)       (843,022)
Comprehensive income for the year       12,685,826 (243,549) $ 12,442,277
Balance at Dec. 31, 2014 $ 442,850 $ (7,541,264) 499,862,062 99,919,646 (293,020) 592,390,274
Balance (in Shares) at Dec. 31, 2014 44,285,108 (1,395,335)        
Stock repurchase   $ (12,945,608)       $ (12,945,608)
Stock repurchase (in Shares)   (2,372,097)       (2,372,097)
Stock based compensation     1,140,084     $ 1,140,084
Comprehensive income for the year       2,566,678 (100,268) 2,466,410
Balance at Dec. 31, 2015 $ 442,850 $ (20,486,872) $ 501,002,146 $ 102,486,324 $ (393,288) $ 583,051,160
Balance (in Shares) at Dec. 31, 2015 44,285,108 (3,767,432)