CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Net cash provided by operating activities - continuing operations	$ 11,909,538	$ 12,039,106
Net cash provided by operating activities - discontinued operations	(1,390,227)	(1,511,952)
Net cash provided by operating activities	10,519,311	10,527,154
Cash flows from investing activities
Additions to property, plant and equipment and construction in progress	(1,571,450)	(2,673,192)
Proceeds from asset dispositions	450	548,480
Proceeds from sale of discontinued operations, net of cash provided	0	6,971,234
Collections on loans receivable	0	734,980
Net cash provided by (used in) investing activities	(10,971,000)	5,581,502
Cash flows from financing activities
Dividends paid to common shareholders	(3,849,075)	(3,827,160)
Dividends paid to preferred shareholders	(9,180)	(9,157)
Repurchase of redeemable preferred stock	(1,144)	(24,096)
Principal repayments on long-term debt	(22,874)	0
Proceeds received from exercise of stock options	10,161	15,822
Net cash used in financing activities	(3,872,112)	(3,844,591)
Net increase (decrease) in cash and cash equivalents	(4,323,801)	12,264,065
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	(399,454)	(1,361,514)
Cash and cash equivalents at end of period	38,179,414	42,240,028
Cash and cash equivalents at end of period	38,179,414	40,629,557
Restricted cash at end of period	0	1,610,471
Cash and cash equivalents and restricted cash at end of period	38,179,414	42,240,028
Interest paid in cash	7,413	19
Non-cash transactions:
Dividends declared but not paid	1,288,185	1,280,213
Transfers from (to) inventory to (from) property, plant and equipment and construction in progress	12,649	342,619
Transfers from construction in progress to property, plant and equipment	1,494,692	7,408,954
Right-of-use assets obtained in exchange for new operating lease liabilities	299,992	2,132,069
Purchase of equipment through issuance of long-term debt	122,292
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)