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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (USD $)
Total
Redeemable Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Cumulative translation adjustment [Member]
Noncontrolling Interest [Member]
Balance at Dec. 31, 2010 $ 127,983,123 $ 10,070 $ 8,733,236 $ 81,349,944 $ 36,289,706 $ 0 $ 1,600,167
Balance (in shares) at Dec. 31, 2010   16,784 14,555,393        
Issue of share capital 110,985 5,007 6,694 99,284 0 0 0
Issue of share capital (in shares)   8,345 11,158        
Conversion of preferred stock 0 (1,287) 1,287 0 0 0 0
Conversion of preferred stock (in shares)   (2,145) 2,145        
Buyback of preferred stock (4,999) (334) 0 (4,665) 0 0 0
Buyback of preferred stock (in shares)   (557) 0        
Net income 6,551,980 0 0 0 6,113,218 0 438,762
Dividends declared (4,854,381) 0 0 0 (4,371,981) 0 (482,400)
Issue of options and preferred stock 494,648 0 0 494,648 0 0 0
Issue of options and preferred stock (in shares)   0 0        
Balance at Dec. 31, 2011 130,281,356 13,456 8,741,217 81,939,211 38,030,943 0 1,556,529
Balance (in shares) at Dec. 31, 2011   22,427 14,568,696        
Issue of share capital 184,254 6,850 13,013 164,391 0 0 0
Issue of share capital (in shares)   11,417 21,686        
Conversion of preferred stock 0 (1,577) 1,577 0 0 0 0
Conversion of preferred stock (in shares)   (2,629) 2,629        
Buyback of preferred stock (7,789) (570) 0 (7,219)   0 0
Buyback of preferred stock (in shares)   (950) 0        
Net income 9,624,009 0 0 0 9,315,514 0 308,495
Dividends declared (4,453,278) 0 0 0 (4,381,278) 0 (72,000)
Foreign currency translation adjustment (16,210) 0 0 0 0 (15,400) (810)
Capital contribution 135,000 0 0 0 0 0 135,000
Stock-based compensation 371,038 0 0 371,038 0 0 0
Balance at Dec. 31, 2012 136,118,380 18,159 8,755,807 82,467,421 42,965,179 (15,400) 1,927,214
Balance (in shares) at Dec. 31, 2012   30,265 14,593,011        
Issue of share capital 217,873 6,108 15,067 196,698 0 0 0
Issue of share capital (in shares)   10,180 25,111        
Conversion of preferred stock 0 (2,832) 2,832   0 0 0
Conversion of preferred stock (in shares)   (4,720) 4,720        
Buyback of preferred stock (4,265) (313) 0 (3,952) 0 0 0
Buyback of preferred stock (in shares)   (521) 0        
Net income 9,148,489 0 0 0 8,594,519 0 553,970
Exercise of options 514,082 1,323 38,012 474,747 0 0 0
Exercise of options (in shares) 65,559 2,204 63,355        
Dividends declared (4,404,150) 0 0 0 (4,404,150) 0 0
Foreign currency translation adjustment (480,614) 0 0 0 0 (456,583) (24,031)
Capital contribution 142,105 0 0 0 0 0 142,105
Stock-based compensation 246,473 0 0 246,473 0 0 0
Balance at Dec. 31, 2013 $ 141,498,373 $ 22,445 $ 8,811,718 $ 83,381,387 $ 47,155,548 $ (471,983) $ 2,599,258
Balance (in shares) at Dec. 31, 2013   37,408 14,686,197