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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Change in:    
Net cash provided by operating activities $ 2,695,699 $ 8,084,316
Cash flows from investing activities    
Purchase of certificate of deposit 0 (5,637,538)
Maturity of certificate of deposit 5,637,538 5,000,000
Additions to property, plant and equipment and construction in progress (1,356,454) (1,424,860)
Proceeds from sale of equipment 526,800 10,160
Acquisition of business, net of cash acquired (7,742,853) 0
Collections on loans receivable 906,012 849,176
Release / (restriction) on cash balance 398,744 (42,090)
Net cash used in investing activities (1,630,213) (1,245,152)
Cash flows from financing activities    
Dividends paid to CWCO common shareholders (2,212,791) (2,210,203)
Dividends paid to non-controlling interests (182,663) (182,663)
Dividends paid to CWCO preferred shareholders (5,760) (2,763)
Repurchase of redeemable preferred stock (9,598) (2,960)
Proceeds received from exercise of stock options 143,226 210,222
Issuance of note payable to related party 490,000 0
Repayments of demand loan payable (7,000,000) (1,000,000)
Net cash used in financing activities (8,777,586) (3,188,367)
Effect of exchange rate changes on cash 638 (41,957)
Net increase (decrease) in cash and cash equivalents (7,711,462) 3,608,840
Cash and cash equivalents at beginning of period 44,792,734 35,713,689
Cash and cash equivalents at end of period 37,081,272 39,322,529
Interest paid in cash 67,689 76,956
Non-cash investing and financing activities    
Dividends declared but not paid 1,113,844 1,108,963
Transfers from (to) inventory to (from) property, plant and equipment and construction in progress 134,362 92,643
Transfers from construction in progress to property, plant and equipment 1,097,165 1,419,549
Common Stock [Member]    
Non-cash investing and financing activities    
StockIssuedDuringPeriodValueIssuedForServices 106,415 0
Redeemable Preferred Stock [Member]    
Non-cash investing and financing activities    
StockIssuedDuringPeriodValueIssuedForServices 106,357 110,703
Conversion (on a one-to-one basis) of 833 and 0, respectively, shares of redeemable preferred stock to common stock $ 500 $ 0