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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