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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)
Net cash provided by (used in) operating activities	$ (288,649)	$ 3,693,963
Cash flows from investing activities
Additions to property, plant and equipment and construction in progress	(516,331)	(1,336,022)
Proceeds from asset dispositions	450	46,700
Proceeds from sale of discontinued operations, net of cash provided	0	6,706,234
Acquisition of noncontrolling interest in Aerex	(8,500,000)	0
Collections on loans receivable	0	364,515
Net cash provided by (used in) investing activities	(9,015,881)	5,781,427
Cash flows from financing activities
Dividends paid to common shareholders	(1,280,993)	(1,275,151)
Dividends paid to preferred shareholders	(2,869)	(2,958)
Repurchase of redeemable preferred stock	0	(17,795)
Principal repayments of long-term debt	(3,496)	0
Net cash used in financing activities	(1,287,358)	(1,295,904)
Net increase (decrease) in cash and cash equivalents	(10,591,888)	8,179,486
Cash and cash equivalents at beginning of period	42,902,669	31,337,477
Cash and cash equivalents at end of period	32,310,781	39,516,963
Cash and cash equivalents at end of period	32,310,781	38,016,963
Restricted cash at end of period	0	1,500,000
Cash and cash equivalents and restricted cash at end of period	32,310,781	39,516,963
Interest paid in cash	2,526	0
Non-cash transactions:
Dividends declared but not paid	1,290,058	1,280,903
Transfers from (to) inventory to (from) property, plant and equipment and construction in progress	(71,719)	131,439
Transfers from construction in progress to property, plant and equipment	1,336,271	6,769,561
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 78,003	$ 3,464,670

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