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 (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	0
Buyback of preferred stock (in shares)		(950)
Net income	9,624,009us-gaap_ProfitLoss	0	0	0	9,315,514	0	308,495
Dividends declared	(4,453,278)us-gaap_DividendsCash	0	0	0	(4,381,278)	0	(72,000)
Foreign currency translation adjustment	(16,210)	0	0	0	0	(15,400)	(810)
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)
Net income	9,148,489us-gaap_ProfitLoss	0	0	0	8,594,519	0	553,970
Exercise of options	514,081	1,322	38,012	474,747	0	0	0
Dividends declared	(4,404,150)us-gaap_DividendsCash	0	0	0	(4,404,150)	0	0
Foreign currency translation adjustment	(480,614)	0	0	0	0	(456,583)	(24,031)
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)		(12,569)	0	0	0
Buyback of preferred stock (in shares)		(1,822)	0
Net income	6,764,540us-gaap_ProfitLoss	0	0	0	6,265,358	0	499,182
Exercise of options	53,136	32	3,991	49,113	0	0	0
Dividends declared	(4,584,681)us-gaap_DividendsCash	0	0	0	(4,420,285)	0	(164,396)
Foreign currency translation adjustment	(10,953)	0	0	0	0	(10,405)	(548)
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

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