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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net cash provided by (used in) operating activities $ 679,081 $ (719,492)
Cash flows from investing activities    
Additions to property, plant and equipment and construction in progress (2,869,484) (1,766,007)
Proceeds from sale of equipment 11,190 9,627
Collections on loans receivable 341,655 479,412
Net cash used in investing activities (2,516,639) (1,276,968)
Cash flows from financing activities    
Dividends paid to common shareholders (1,269,696) (1,114,469)
Dividends paid to preferred shareholders (2,846) (2,642)
Issuance (repayment) of note payable to related party (392,000) 392,000
Net cash used in financing activities (1,664,542) (725,111)
Net increase (decrease) in cash and cash equivalents (3,502,100) (2,721,571)
Cash and cash equivalents at beginning of period 47,182,966 39,254,116
Cash and cash equivalents at end of period 43,680,866 36,532,545
Interest paid in cash 4,427 0
Non-cash investing and financing activities    
Issuance of 39,986 and 17,833, respectively, shares of common stock for services rendered 441,162 203,551
Conversion (on a one-to-one basis) of 454 and 0, respectively, shares of redeemable preferred stock to common stock 272 0
Dividends declared but not paid 1,274,350 1,119,355
Transfers from inventory to property, plant and equipment and construction in progress 89,721 70,545
Transfers from construction in progress to property, plant and equipment 243,689 140,499
Transfers from other assets to construction in progress $ 765,662 $ 0