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, 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
Issuance of share capital	$ 4,376	$ 35,683	(40,059)	0	0	0	0
Issuance of share capital (in shares)	7,293	59,472
Conversion of preferred stock	$ (4,338)	$ 4,338	0	0	0	0	0
Conversion of preferred stock (in shares)	(7,230)	7,230
Buyback of preferred stock	$ (1,605)	$ 0	(22,491)	0	0	0	(24,096)
Buyback of preferred stock (in shares)	(2,674)	0
Net income	$ 0	$ 0	0	12,176,093	0	1,549,978	13,726,071
Exercise of options	$ 940	$ 0	14,882	0	0	0	15,822
Exercise of options (in shares)	1,566	0
Dividends declared	$ 0	$ 0	0	(5,121,521)	0	0	(5,121,521)
PERC non-controlling interest at acquisition date	0	0	0	0	0	3,617,634	3,617,634
Sale of CW-Bali	0	0	0	0	549,555	241,282	790,837
Stock-based compensation	0	0	1,192,224	0	0	0	1,192,224
Balance at Dec. 31, 2019	$ 20,251	$ 9,029,765	88,356,509	66,352,733	0	14,193,616	177,952,874
Balance (in shares) at Dec. 31, 2019	33,751	15,049,608
Issuance of share capital	$ 3,674	$ 50,766	(54,440)	0	0	0	0
Issuance of share capital (in shares)	6,123	84,610
Conversion of preferred stock	$ (5,679)	$ 5,679	0	0	0	0	0
Conversion of preferred stock (in shares)	(9,465)	9,465
Buyback of preferred stock	$ (105)	$ 0	(1,623)	0	0	0	(1,728)
Buyback of preferred stock (in shares)	(176)	0
Net income	$ 0	$ 0	0	3,711,528	0	730,005	4,441,533
Exercise of options	$ 500	$ 0	9,661	0	0	0	$ 10,161
Exercise of options (in shares)	835	0					835
Purchase of noncontrolling interests in Aerex and PERC	$ 0	$ 0	(2,579,882)	0	0	(6,820,118)	$ (9,400,000)
Dividends declared	0	0	0	(5,153,552)	0	0	(5,153,552)
Stock-based compensation	0	0	1,163,261	0	0	0	1,163,261
Balance at Dec. 31, 2020	$ 18,641	$ 9,086,210	$ 86,893,486	$ 64,910,709	$ 0	$ 8,103,503	$ 169,012,549
Balance (in shares) at Dec. 31, 2020	31,068	15,143,683