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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

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- Definition Amount of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 39 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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