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Segment information (Details 1) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Entity Wide Revenues Major Customer Amount $ 63,822,131 $ 65,450,702 $ 55,154,492
Cayman Islands [Member]
      
Segment Reporting Information [Line Items]      
Entity Wide Revenues Major Customer Amount 31,164,165 33,661,440 32,223,536
Bahamas [Member]
      
Segment Reporting Information [Line Items]      
Entity Wide Revenues Major Customer Amount 29,192,529 28,996,724 19,825,070
Indonesia [Member]
      
Segment Reporting Information [Line Items]      
Entity Wide Revenues Major Customer Amount 144,030 0 0
Belize [Member]
      
Segment Reporting Information [Line Items]      
Entity Wide Revenues Major Customer Amount 2,536,780 2,322,913 2,065,606
Bermuda [Member]
      
Segment Reporting Information [Line Items]      
Entity Wide Revenues Major Customer Amount 0 0 722,774
Oc Bvi [Member]
      
Segment Reporting Information [Line Items]      
Entity Wide Revenues Major Customer Amount 784,627 469,625 317,506
Water And Sewerage Corporation [Member]
      
Segment Reporting Information [Line Items]      
Entity Wide Revenues Major Customer Amount 28,861,195 28,765,529 19,610,650
Entity Wide Revenues Major Customer Percentage 45.00% 44.00% 36.00%
Water Authority Cayman [Member]
      
Segment Reporting Information [Line Items]      
Entity Wide Revenues Major Customer Amount $ 8,230,912 $ 9,438,545 $ 8,867,198
Entity Wide Revenues Major Customer Percentage 13.00% 14.00% 16.00%