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Contingencies (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Commitments And Contingencies [Line Items] |  |  |  |  |
Cayman Water Retail Operations, Percentage Of Gross Profit | 53.00% | 57.00% | 55.00% | 59.00% |
Cayman Water Retail Operations, Percentage Of Revenue | 38.00% | 41.00% | 39.00% | 42.00% |
WSC [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Accounts Receivable, Net | $ 12.7 |  | $ 12.7 |  | $ 17.6

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