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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
Redeemable preferred stock [Member]
Common stock [Member]
Additional paid-in capital [Member]
Retained earnings [Member]
Non controlling interests [Member]
Total
Balance at Dec. 31, 2019 $ 20,251 $ 9,029,765 $ 88,356,509 $ 66,352,733 $ 14,193,616 $ 177,952,874
Balance (in shares) at Dec. 31, 2019 33,751 15,049,608        
Issuance of share capital $ 0 $ 38,939 (38,939) 0 0 0
Issuance of share capital (in shares) 0 64,898        
Net income (loss) $ 0 $ 0 0 2,888,607 360,998 3,249,605
Purchase of noncontrolling interests in Aerex and PERC     (2,444,047)   (6,055,953) (8,500,000)
Dividends declared 0 0 0 (1,289,378) 0 (1,289,378)
Stock-based compensation 0 0 161,406 0 0 161,406
Balance at Mar. 31, 2020 $ 20,251 $ 9,068,704 86,034,929 67,951,962 8,498,661 171,574,507
Balance (in shares) at Mar. 31, 2020 33,751 15,114,506        
Issuance of share capital $ 3,674   (3,674)      
Issuance of share capital (in shares) 6,123          
Net income (loss)       (1,127,842) 180,154 (947,688)
Exercise of options $ 217   4,201     4,418
Exercise of options (in shares) 363          
Dividends declared       (1,287,474)   (1,287,474)
Stock-based compensation     199,065     199,065
Balance at Jun. 30, 2020 $ 24,142 $ 9,068,704 86,234,521 65,536,646 8,678,815 169,542,828
Balance (in shares) at Jun. 30, 2020 40,237 15,114,506        
Balance at Dec. 31, 2020 $ 18,641 $ 9,086,210 86,893,486 64,910,709 8,103,503 169,012,549
Balance (in shares) at Dec. 31, 2020 31,068 15,143,683        
Issuance of share capital $ 0 $ 34,546 (34,546) 0 0 0
Issuance of share capital (in shares) 0 57,577        
Conversion of preferred stock $ (129) $ 129        
Conversion of preferred stock (in shares) (215) 215        
Buyback of preferred stock $ (448)   (7,065)     (7,513)
Buyback of preferred stock (in shares) (747)          
Net income (loss) $ 0 $ 0 0 988,772 128,793 1,117,565
Dividends declared 0 0 0 (1,296,197) (649,880) (1,946,077)
Stock-based compensation 0 0 176,210 0 0 176,210
Balance at Mar. 31, 2021 $ 18,064 $ 9,120,885 87,028,085 64,603,284 7,582,416 168,352,734
Balance (in shares) at Mar. 31, 2021 30,106 15,201,475        
Issuance of share capital $ 5,179   (5,179)      
Issuance of share capital (in shares) 8,632          
Conversion of preferred stock $ (538) $ 538        
Conversion of preferred stock (in shares) (896) 896        
Buyback of preferred stock $ (422)   (6,928)     (7,350)
Buyback of preferred stock (in shares) (704)          
Net income (loss)       (1,664,649) 197,138 (1,467,511)
Exercise of options $ 126   1,583     1,709
Exercise of options (in shares) 211          
Dividends declared       (1,294,697)   (1,294,697)
Stock-based compensation     178,589     178,589
Balance at Jun. 30, 2021 $ 22,409 $ 9,121,423 $ 87,196,150 $ 61,643,938 $ 7,779,554 $ 165,763,474
Balance (in shares) at Jun. 30, 2021 37,349 15,202,371