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CONDENSED 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, 2017 $ 156,021,377 $ 20,093 $ 8,951,321 $ 86,405,387 $ 53,105,196 $ (549,555) $ 8,088,935
Balance (in shares) at Dec. 31, 2017   33,488 14,918,869        
Issue of share capital 58,374 $ 0 $ 23,991 34,383 0 0 0
Issue of share capital (in shares)   0 39,986        
Conversion of preferred stock 0 $ (273) $ 273 0 0 0 0
Conversion of preferred stock (in shares)   (454) 454        
Net income 2,058,032 $ 0 $ 0 0 2,092,525 0 (34,493)
Dividends declared (1,275,961) 0 0 0 (1,275,961) 0 0
Stock-based compensation 103,521 0 0 103,521 0 0 0
Balance at Mar. 31, 2018 156,965,343 $ 19,820 $ 8,975,585 86,543,291 53,921,760 (549,555) 8,054,442
Balance (in shares) at Mar. 31, 2018   33,034 14,959,309        
Balance at Dec. 31, 2018 163,755,903 $ 20,878 $ 8,989,744 87,211,953 59,298,161 (549,555) 8,784,722
Balance (in shares) at Dec. 31, 2018   34,796 14,982,906        
Issue of share capital 78,849 $ 0 $ 16,118 62,731 0 0 0
Issue of share capital (in shares)   0 26,864        
Buyback of preferred stock (17,795) $ (1,190) $ 0 (16,605) 0 0 0
Buyback of preferred stock (in shares)   (1,983)          
Net income 6,460,339 $ 0 0 0 6,186,431 0 273,908
Dividends declared (1,280,223) 0 0 0 (1,280,223) 0 0
Stock-based compensation 77,213 0 0 77,213 0 0 0
Balance at Mar. 31, 2019 $ 169,074,286 $ 19,688 $ 9,005,862 $ 87,335,292 $ 64,204,369 $ (549,555) $ 9,058,630
Balance (in shares) at Mar. 31, 2019   32,813 15,009,770