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Consolidated Statements of Shareholders' Equity (USD $)
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2009 $ 925,492 $ 235,588,391 $ (5,060,620) $ 231,453,263
Balance (in Shares) at Dec. 31, 2009 30,849,711      
Net income (loss)     (6,605,850) (6,605,850)
Issuance of restricted shares for stock incentive award and share-based compensation 4,575 691,540   696,115
Issuance of restricted shares for stock incentive award and share-based compensation (in Shares) 152,500      
Dividends declared (see Note 13)     (6,848,536) (6,848,536)
Balance at Dec. 31, 2010 930,067 236,279,931 (18,515,006) 218,694,992
Balance (in Shares) at Dec. 31, 2010 31,002,211      
Net income (loss)     1,115,989 1,115,989
Issuance of restricted shares for stock incentive award and share-based compensation 4,950 563,539   568,489
Issuance of restricted shares for stock incentive award and share-based compensation (in Shares) 165,000      
Dividends declared (see Note 13)     (8,457,722) (8,457,722)
Balance at Dec. 31, 2011 935,017 236,843,470 (25,856,739) 211,921,748
Balance (in Shares) at Dec. 31, 2011 31,167,211      
Net income (loss)     (13,198,741) (13,198,741)
Issuance of shares in “Rights Offering Program, net of issuance costs” 415,562 14,252,617   14,668,179
Issuance of shares in “Rights Offering Program, net of issuance costs” (in Shares) 13,852,094     13,852,094
Issuance of restricted shares for stock incentive award and share-based compensation 9,009 662,372   671,381
Issuance of restricted shares for stock incentive award and share-based compensation (in Shares) 300,300      
Dividends declared (see Note 13)     (4,436,421) (4,436,421)
Balance at Dec. 31, 2012 $ 1,359,588 $ 251,758,459 $ (43,491,901) $ 209,626,146
Balance (in Shares) at Dec. 31, 2012 45,319,605