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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

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