Segment information (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Entity-Wide Revenue, Major Customer, Amount	$ 65,450,702	$ 55,154,492	$ 50,708,554
Cayman Island Operations [Member]
Entity-Wide Revenue, Major Customer, Amount	33,661,440	32,223,536	30,966,110
Bahamas Operations [Member]
Entity-Wide Revenue, Major Customer, Amount	28,996,724	19,825,070	16,188,416
Belize Operations [Member]
Entity-Wide Revenue, Major Customer, Amount	2,322,913	2,065,606	1,809,504
Bermuda operations
Entity-Wide Revenue, Major Customer, Amount	0	722,774	1,087,786
Water and Sewerage Corporation [Member]
Entity-Wide Revenue, Major Customer, Amount	28,765,529	19,610,650	15,941,021
Entity-Wide Revenue, Major Customer, Percentage	44.00%	36.00%	31.00%
Water Authority - Cayman Member [Member]
Entity-Wide Revenue, Major Customer, Amount	9,438,545	8,867,198	7,304,173
Entity-Wide Revenue, Major Customer, Percentage	14.00%	16.00%	14.00%
OC-BVI [Member]
Entity-Wide Revenue, Major Customer, Amount	$ 469,625	$ 317,506	$ 656,738