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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities |  |
Net income | $ 4,441,533 | $ 13,726,071
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Impairment loss for Mexico assets - discontinued operations | 3,351,842 | 0
Depreciation and amortization of discontinued operations | 4,545 | 4,545
Foreign currency transaction adjustment - discontinued operations | 3,528 | (104,736)
Loss from discontinued operations | 1,542,328 | 2,433,446
Loss on sale of discontinued operations | 0 | (3,621,170)
Depreciation and amortization | 7,406,509 | 7,203,102
Deferred income tax benefit | (221,829) | (239,848)
Provision for doubtful accounts | 129,107 | 0
Unrealized (gain) loss on net put/call option | 26,000 | (56,000)
Compensation expense relating to stock and stock option grants | 1,163,261 | 1,192,224
Gain (Loss) on Disposition of Assets | (13,997) | (445,041)
Foreign currency transaction adjustment | 0 | (255)
Profit-sharing and equity in earnings of OC-BVI | (506,694) | (60,965)
Distribution of earnings from OC-BVI | 318,150 | 742,350
Change in: |  |
Accounts receivable and contract assets | 2,541,096 | (356,223)
Inventory | (102,551) | (1,357,032)
Prepaid expenses and other assets | (629,734) | (298,611)
Accounts payable, accrued expenses and other current liabilities, and contract liabilities | (482,156) | (1,342,463)
Net cash provided by operating activities - continuing operations | 18,970,938 | 17,419,394
Net cash used in operating activities - discontinued operations | (1,635,646) | (2,215,736)
Net cash provided by operating activities | 17,335,292 | 15,203,658
Cash flows from investing activities |  |
Additions to property, plant and equipment and construction in progress | (1,728,393) | (3,525,122)
Proceeds from asset dispositions | 8,638 | 453,480
Proceeds from sale of discontinued operations, net of cash provided | 0 | 6,971,234
Acquisition of PERC, net of cash acquired | 0 | (3,147,438)
Collections on loans receivable | 0 | 734,980
Net cash provided by (used in) investing activities - continuing operations | (11,119,755) | 1,487,134
Net cash used in investing activities - discontinued operations | 0 | (1,499)
Net cash provided by (used in) investing activities | (11,119,755) | 1,485,635
Cash flows from financing activities |  |
Dividends paid to common shareholders | (5,133,727) | (5,097,602)
Dividends paid to preferred shareholders | (11,990) | (18,225)
Repurchase of redeemable preferred stock | (1,728) | (24,096)
Proceeds received from exercise of stock options | 10,161 | 15,822
Principal repayments on long-term debt | (32,642) | 0
Net cash used in financing activities | (5,169,926) | (5,124,101)
Net increase in cash and cash equivalents | 1,045,611 | 11,565,192
Cash and cash equivalents at beginning of period | 42,071,083 | 31,111,968
Cash and cash equivalents at beginning of period - discontinued operations | 831,586 | 225,509
Less: cash and cash equivalents at end of period - discontinued operations | (154,130) | (831,586)
Cash and cash equivalents at end of period | 43,794,150 | 42,071,083
Non-cash transactions: |  |
Right-of-use assets obtained in exchange for new operating lease liabilities | 299,992 | 2,429,305
Aerex |  |
Cash flows from investing activities |  |
Acquisition of noncontrolling interest in subsidiaries | (8,500,000) | 0
PERC Water Corporation |  |
Cash flows from investing activities |  |
Acquisition of noncontrolling interest in subsidiaries | $ (900,000) | $ 0

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