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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) | Redeemable preferred stock [Member] 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 |  | $ 38,939 | (38,939) |  |  |
Issuance of share capital (in shares) |  | 64,898 |  |  |  |
Net income (loss) |  |  |  | 2,888,607 | 360,998 | 3,249,605
Purchase of noncontrolling interests in subsidiary |  |  | (2,444,047) |  | (6,055,953) | (8,500,000)
Dividends declared |  |  |  | (1,289,378) |  | (1,289,378)
Stock-based compensation |  |  | 161,406 |  |  | 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 |  |  |  |
Conversion of preferred stock | $ (4,526) | $ 4,526 |  |  |  |
Conversion of preferred stock (in shares) | (7,543) | 7,543 |  |  |  |
Buyback of preferred stock | $ (64) |  | (1,080) |  |  | (1,144)
Buyback of preferred stock (in shares) | (107) |  |  |  |  |
Net income (loss) |  |  |  | 1,434,835 | 101,137 | 1,535,972
Exercise of options | $ 283 |  | 5,460 |  |  | 5,743
Exercise of options (in shares) | 472 |  |  |  |  |
Purchase of noncontrolling interests in subsidiary |  |  | (135,835) |  | (764,165) | (900,000)
Dividends declared |  |  |  | (1,287,526) |  | (1,287,526)
Stock-based compensation |  |  | 486,991 |  |  | 486,991
Balance at Sep. 30, 2020 | $ 19,835 | $ 9,073,230 | 86,590,057 | 65,683,955 | 8,015,787 | 169,382,864
Balance (in shares) at Sep. 30, 2020 | 33,059 | 15,122,049 |  |  |  |
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 |  | $ 34,546 | (34,546) |  |  |
Issuance of share capital (in shares) |  | 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) |  |  |  | 988,772 | 128,793 | 1,117,565
Dividends declared |  |  |  | (1,296,197) | (649,880) | (1,946,077)
Stock-based compensation |  |  | 176,210 |  |  | 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 |  |  |  |
Conversion of preferred stock | $ (4,996) | $ 4,996 |  |  |  |
Conversion of preferred stock (in shares) | (8,328) | 8,328 |  |  |  |
Net income (loss) |  |  |  | 285,593 | 131,609 | 417,202
Exercise of options | $ 1,137 |  | 14,213 |  |  | 15,350
Exercise of options (in shares) | 1,895 |  |  |  |  |
Dividends declared |  |  |  | (1,294,870) |  | (1,294,870)
Stock-based compensation |  |  | 374,793 |  |  | 374,793
Balance at Sep. 30, 2021 | $ 18,550 | $ 9,126,419 | $ 87,585,156 | $ 60,634,661 | $ 7,911,163 | $ 165,275,949
Balance (in shares) at Sep. 30, 2021 | 30,916 | 15,210,699 |  |  |  |

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant