CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Net cash provided by (used in) operating activities	$ (2,105,154)	$ 10,638,537
Cash flows from investing activities
Additions to property, plant and equipment and construction in progress	(8,727,473)	(2,551,511)
Proceeds from sale of equipment	11,190	18,027
Collections on loans receivable	688,888	966,651
Payment for land held for development	(25,152)	0
Net cash used in investing activities	(8,052,547)	(1,566,833)
Cash flows from financing activities
Dividends paid to common shareholders	(2,543,807)	(2,231,021)
Dividends paid to preferred shareholders	(2,846)	(5,284)
Issuance of redeemable preferred stock	5,735	6,588
Repayment of note payable to related party	(392,000)	(490,000)
Issuance of note payable to related party	0	392,000
Net cash used in financing activities	(2,932,918)	(2,327,717)
Net increase (decrease) in cash and cash equivalents	(13,090,619)	6,743,987
Cash and cash equivalents at beginning of period	47,182,966	39,254,116
Cash and cash equivalents at end of period	34,092,347	45,998,103
Interest paid in cash	6,539	7,074
Non-cash investing and financing activities
Conversion (on a one-to-one basis) of 454 and 368, respectively, shares of redeemable preferred stock to common stock	272	221
Dividends declared but not paid	1,275,030	1,120,122
Transfers from inventory to property, plant and equipment and construction in progress	192,748	147,886
Transfers from construction in progress to property, plant and equipment	354,771	289,915
Transfers from other assets to construction in progress	1,253,299	0
Obligation incurred for investment in land	59,084	0
Common Stock [Member]
Non-cash investing and financing activities
Stock Issued	441,161	203,551
Preferred Stock [Member]
Non-cash investing and financing activities
Stock Issued	$ 96,317	$ 118,485