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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Net cash provided by operating activities - continuing operations $ 5,285,457 $ 11,909,538
Net cash used in operating activities - discontinued operations (820,785) (1,390,227)
Net cash provided by operating activities 4,464,672 10,519,311
Cash flows from investing activities    
Purchase of certificate of deposit (2,500,000)  
Additions to property, plant and equipment and construction in progress (973,270) (1,571,450)
Proceeds from asset dispositions 45,560 450
Purchase of non-controlling interest in PERC   (900,000)
Net cash used in investing activities (3,427,710) (10,971,000)
Cash flows from financing activities    
Dividends paid to common shareholders (3,859,412) (3,849,075)
Dividends paid to preferred shareholders (8,387) (9,180)
Dividends paid to non-controlling interests (649,880)  
Repurchase of redeemable preferred stock (14,863) (1,144)
Proceeds received from exercise of stock options 17,059 10,161
Principal repayments on long-term debt (35,840) (22,874)
Net cash used in financing activities (4,551,323) (3,872,112)
Net decrease in cash and cash equivalents (3,514,361) (4,323,801)
Cash and cash equivalents at beginning of period 43,794,150 42,071,083
Cash and cash equivalents at beginning of period - discontinued operations 154,130 831,586
Less: cash and cash equivalents at end of period - discontinued operations (36,326) (399,454)
Cash and cash equivalents at end of period 40,397,593 38,179,414
Interest paid in cash 7,714 7,413
Non-cash transactions:    
Dividends declared but not paid 1,295,538 1,288,185
Transfers from (to) inventory to (from) property, plant and equipment and construction in progress 191,434 12,649
Transfers from construction in progress to property, plant and equipment 375,906 1,494,692
Right-of-use assets obtained in exchange for new operating lease liabilities 1,852,608 299,992
Purchase of equipment through issuance of long-term debt 58,220 122,292
Aerex    
Cash flows from investing activities    
Acquisition of noncontrolling interest in subsidiaries $ 0 $ (8,500,000)