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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]
Non-controlling interests [Member]
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 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)   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        
Issue of share capital 259,337 $ 3,574 $ 10,976 244,787 0 0 0
Issue of share capital (in shares)   5,957 18,294        
Conversion of preferred stock 0 $ (2,854) $ 2,854 0 0 0 0
Conversion of preferred stock (in shares)   (4,756) 4,756        
Buyback of preferred stock (13,662) $ (1,093) $ 0 (12,569) 0 0 0
Buyback of preferred stock (in shares)   (1,822) 0        
Net income 6,764,540 $ 0 $ 0 0 6,265,358 0 499,182
Exercise of options 53,136 $ 32 $ 3,991 49,113 0 0 0
Exercise of options (in shares)   53 6,652        
Dividends declared (4,584,681) $ 0 $ 0 0 (4,420,285) 0 (164,396)
Foreign currency translation adjustment (10,953) 0 0 0 0 (10,405) (548)
Stock-based compensation 116,574 0 0 116,574 0 0 0
Balance at Dec. 31, 2014 144,082,664 $ 22,104 $ 8,829,539 83,779,292 49,000,621 (482,388) 2,933,496
Balance (in shares) at Dec. 31, 2014   36,840 14,715,899        
Issue of share capital 143,218 $ 5,169 $ 6,308 131,741 0 0 0
Issue of share capital (in shares)   8,615 10,514        
Conversion of preferred stock 0 $ (4,317) $ 4,317 0 0 0 0
Conversion of preferred stock (in shares)   (7,195) 7,195        
Buyback of preferred stock (6,014) $ (449) $ 0 (5,565) 0 0 0
Buyback of preferred stock (in shares)   (748) 0        
Net income 7,925,494 $ 0 $ 0 0 7,518,701 0 406,793
Exercise of options 456,763 $ 775 $ 28,557 427,431 0 0 0
Exercise of options (in shares)   1,292 47,593        
Dividends declared (4,617,810) $ 0 $ 0 0 (4,435,147) 0 (182,663)
Foreign currency translation adjustment (53,660) 0 0 0 0 (50,977) (2,683)
Stock-based compensation 264,450 0 0 264,450 0 0 0
Balance at Dec. 31, 2015 $ 148,195,105 $ 23,282 $ 8,868,721 $ 84,597,349 $ 52,084,175 $ (533,365) $ 3,154,943
Balance (in shares) at Dec. 31, 2015   38,804 14,781,201