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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) |  |  |  |

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831223 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 + Details
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