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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities      
Net income $ 7,925,494 $ 6,764,540 $ 9,148,489
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 5,657,580 5,524,359 5,472,116
Amortization of other assets 179,353 179,353 179,353
Land lease 23,014 25,968 27,371
Provision for doubtful accounts 0 0 32,933
Compensation expense relating to stock and stock option grants 407,668 202,454 381,976
Net loss on disposal of fixed assets 32,566 77,495 14,562
Foreign currency transaction adjustment 420,641 107,839 245,684
Profit sharing and equity in earnings of OC-BVI (399,668) (414,755) (1,337,352)
Impairment losses 1,060,000 860,000 200,000
Unrealized gain on marketable securities 0 0 (17,137)
Change in:      
Accounts receivable and Costs and estimated earnings in excess of billings 3,402,728 5,988,523 (6,387,462)
Inventory (732,588) (566,928) (65,637)
Prepaid expenses and other assets 276,116 423,893 (137,563)
Accounts payable and other liabilities and Billings in excess of costs and estimated earnings - construction project (933,118) (987,880) 1,622,611
Net cash provided by operating activities 17,319,786 18,184,861 9,379,944
Cash flows from investing activities      
Purchase of certificate of deposit (5,637,538) (5,000,000) 0
Maturity of certificate of deposit 5,000,000 0 0
Additions to property, plant and equipment and construction in progress (3,113,565) (3,626,278) (4,315,389)
Proceeds from sale of equipment 10,160 13,620 13,740
Distribution of earnings from OC-BVI 0 969,600 1,439,250
Collections on loans receivable 1,726,310 1,691,102 1,812,533
Sale of marketable securities 0 8,587,475 0
Payment for land held for development 0 (7,382,858) (3,125,566)
Payment of land purchase obligation 0 (10,050,000) 0
Restriction on cash balance (42,716) (456,083) 0
Net cash used in investing activities (2,057,349) (15,253,422) (4,175,432)
Cash flows from financing activities      
Dividends paid to CWCO common shareholders (4,417,534) (4,407,249) (4,388,708)
Dividends paid to CWCO preferred shareholders (11,881) (11,528) (10,383)
Dividends paid to non-controlling interests (201,473) (164,396) 0
Repurchase of redeemable preferred stock (6,014) (13,077) 9,313
Proceeds received from exercise of stock options 456,763 52,551 500,505
Principal repayments of long term debt 0 (5,301,327) (1,724,025)
Capital contribution from non-controlling interest 0 0 142,105
Proceeds received from demand loan payable 0 10,000,000 0
Repayments of demand loan payable (2,000,000) (1,000,000) 0
Net cash used in financing activities (6,180,139) (845,026) (5,471,193)
Effect of exchange rate changes on cash (3,253) 760 542
Net increase (decrease) in cash and cash equivalents 9,079,045 2,087,173 (266,139)
Cash and cash equivalents at beginning of period 35,713,689 33,626,516 33,892,655
Cash and cash equivalents at end of period $ 44,792,734 $ 35,713,689 $ 33,626,516