CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)	Redeemable preferred stock [Member]	Common stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Cumulative translation adjustment [Member]	Non controlling interests [Member]	Total
Balance at Dec. 31, 2017	$ 20,093	$ 8,951,321	$ 86,405,387	$ 53,105,196	$ (549,555)	$ 8,088,935	$ 156,021,377
Balance (in shares) at Dec. 31, 2017	33,488	14,918,869
Issue of share capital	$ 0	$ 23,991	(23,991)	0	0	0	0
Issue of share capital (in shares)	0	39,986
Conversion of preferred stock	$ (273)	$ 273	0	0	0	0	0
Conversion of preferred stock (in shares)	(454)	454
Net income	$ 0	$ 0	0	2,092,525	0	(34,493)	2,058,032
Dividends declared	0	0	0	(1,275,961)	0	0	(1,275,961)
Stock-based compensation	0	0	161,895	0	0	0	161,895
Balance at Mar. 31, 2018	$ 19,820	$ 8,975,585	86,543,291	53,921,760	(549,555)	8,054,442	156,965,343
Balance (in shares) at Mar. 31, 2018	33,034	14,959,309
Issue of share capital	$ 4,446	$ 0	(4,446)	0	0	0	0
Issue of share capital (in shares)	7,409
Net income	$ 0	0	0	2,188,193	0	208,692	2,396,885
Exercise of options	$ 354	0	5,381	0	0	0	5,735
Exercise of options (in shares)	590
Dividends declared	$ 0	0	0	(1,274,350)	0	0	(1,274,350)
Stock-based compensation	0	0	173,319	0	0	0	173,319
Balance at Jun. 30, 2018	$ 24,620	$ 8,975,585	86,717,545	54,835,603	(549,555)	8,263,134	158,266,932
Balance (in shares) at Jun. 30, 2018	41,033	14,959,309
Conversion of preferred stock	$ (2,984)	$ 2,984	0	0	0	0	0
Conversion of preferred stock (in shares)	(4,972)	4,972
Buyback of preferred stock	$ (184)	$ 0	(2,534)	0	0	0	(2,718)
Buyback of preferred stock (in shares)	(308)	0
Net income	$ 0	$ 0	0	4,552,389	0	310,579	4,862,968
Exercise of options	$ 447	0	6,794	0	0	0	7,241
Exercise of options (in shares)	745
Dividends declared	$ 0	0	0	(1,274,386)	0	0	(1,274,386)
Stock-based compensation	0	0	182,718	0	0	0	182,718
Balance at Sep. 30, 2018	$ 21,899	$ 8,978,569	86,904,523	58,113,606	(549,555)	8,573,713	162,042,755
Balance (in shares) at Sep. 30, 2018	36,498	14,964,281
Balance at Dec. 31, 2018	$ 20,878	$ 8,989,744	87,211,953	59,298,161	(549,555)	8,784,722	163,755,903
Balance (in shares) at Dec. 31, 2018	34,796	14,982,906
Issue of share capital	$ 0	$ 16,118	(16,118)	0	0	0
Issue of share capital (in shares)	0	26,864
Buyback of preferred stock	$ (1,190)	$ 0	(16,605)	0	0	0	(17,795)
Buyback of preferred stock (in shares)	(1,983)
Net income	$ 0	0	0	6,186,431	0	273,908	6,460,339
Dividends declared	0	0	0	(1,280,223)	0	0	(1,280,223)
Stock-based compensation	0	0	156,062	0	0	0	156,062
Balance at Mar. 31, 2019	$ 19,688	$ 9,005,862	87,335,292	64,204,369	(549,555)	9,058,630	169,074,286
Balance (in shares) at Mar. 31, 2019	32,813	15,009,770
Issue of share capital	$ 4,376	$ 6,344	(10,720)	0	0	0
Issue of share capital (in shares)	7,293	10,574
Buyback of preferred stock	$ (415)	$ 0	(5,886)	0	0	0	(6,301)
Buyback of preferred stock (in shares)	(691)
Net income	$ 0	0	0	2,476,262	0	464,896	2,941,158
Exercise of options	$ 423	0	6,700	0	0	0	7,123
Exercise of options (in shares)	705
Dividends declared	$ 0	0	0	(1,280,359)	0	0	(1,280,359)
Sale of CW-Bali	0	0	0	0	549,555	241,282	790,837
Stock-based compensation	0	0	209,049	0	0	0	209,049
Balance at Jun. 30, 2019	$ 24,072	$ 9,012,206	87,534,435	65,400,272	0	9,764,808	171,735,793
Balance (in shares) at Jun. 30, 2019	40,120	15,020,344
Conversion of preferred stock	$ (4,338)	$ 4,338	0	0	0	0
Conversion of preferred stock (in shares)	(7,230)	7,230
Net income	$ 0	$ 0	0	1,727,052	0	433,235	2,160,287
Exercise of options	$ 517	0	8,182	0	0	0	8,699
Exercise of options (in shares)	861
Dividends declared	$ 0	0	0	(1,279,533)	0	0	(1,279,533)
Stock-based compensation	0	0	315,634	0	0	0	315,634
Balance at Sep. 30, 2019	$ 20,251	$ 9,016,544	$ 87,858,251	$ 65,847,791	$ 0	$ 10,198,043	$ 172,940,880
Balance (in shares) at Sep. 30, 2019	33,751	15,027,574