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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) | Total | Redeemable Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Cumulative translation adjustment [Member] | Non-controlling interests [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 144,082,664 | $ 22,104 | $ 8,829,539 | $ 83,779,292 | $ 49,000,621 | $ (482,388) | $ 2,933,496
Balance (in shares) at Dec. 31, 2014 |  | 36,840 | 14,715,899 |  |  |  |
Issue of share capital | 143,218 | $ 5,169 | $ 6,308 | 131,741 | 0 | 0 | 0
Issue of share capital (in shares) |  | 8,615 | 10,514 |  |  |  |
Conversion of preferred stock | 0 | $ (4,317) | $ 4,317 | 0 | 0 | 0 | 0
Conversion of preferred stock (in shares) |  | (7,195) | 7,195 |  |  |  |
Buyback of preferred stock | (6,014) | $ (449) | $ 0 | (5,565) | 0 | 0 | 0
Buyback of preferred stock (in shares) |  | (748) | 0 |  |  |  |
Net income | 7,925,494 | $ 0 | $ 0 | 0 | 7,518,701 | 0 | 406,793
Exercise of options | 456,763 | $ 775 | $ 28,557 | 427,431 | 0 | 0 | 0
Exercise of options (in shares) |  | 1,292 | 47,593 |  |  |  |
Dividends declared | (4,617,810) | $ 0 | $ 0 | 0 | (4,435,147) | 0 | (182,663)
Foreign currency translation adjustment | (53,660) | 0 | 0 | 0 | 0 | (50,977) | (2,683)
Stock-based compensation | 264,450 | 0 | 0 | 264,450 | 0 | 0 | 0
Balance at Dec. 31, 2015 | 148,195,105 | $ 23,282 | $ 8,868,721 | 84,597,349 | 52,084,175 | (533,365) | 3,154,943
Balance (in shares) at Dec. 31, 2015 |  | 38,804 | 14,781,201 |  |  |  |
Issue of share capital | 179,573 | $ 5,053 | $ 15,094 | 159,426 | 0 | 0 | 0
Issue of share capital (in shares) |  | 8,421 | 25,156 |  |  |  |
Conversion of preferred stock | 0 | $ (6,935) | $ 6,935 | 0 | 0 | 0 | 0
Conversion of preferred stock (in shares) |  | (11,558) | 11,558 |  |  |  |
Buyback of preferred stock | (14,054) | $ (1,053) | $ 0 | (13,001) | 0 | 0 | 0
Buyback of preferred stock (in shares) |  | (1,755) | 0 |  |  |  |
Net income | 2,777,313 | $ 0 | $ 0 | 0 | 3,960,501 | 0 | (1,183,188)
Exercise of options | 568,849 | $ 788 | $ 32,248 | 535,813 | 0 | 0 | 0
Exercise of options (in shares) |  | 1,313 | 53,749 |  |  |  |
Dividends declared | (4,638,002) | $ 0 | $ 0 | 0 | (4,455,339) | 0 | (182,663)
Foreign currency translation adjustment | (17,042) | 0 | 0 | 0 | 0 | (16,190) | (852)
Aerex non-controlling interest at acquisition date | 6,712,184 | 0 | 0 | 0 | 0 |  | 6,712,184
Stock-based compensation | 341,446 | 0 | 0 | 341,446 | 0 | 0 | 0
Balance at Dec. 31, 2016 | 154,105,372 | $ 21,135 | $ 8,922,998 | 85,621,033 | 51,589,337 | (549,555) | 8,500,424
Balance (in shares) at Dec. 31, 2016 |  | 35,225 | 14,871,664 |  |  |  |
Issue of share capital | 210,151 | $ 5,665 | $ 20,995 | 183,491 | 0 | 0 | 0
Issue of share capital (in shares) |  | 9,441 | 34,991 |  |  |  |
Conversion of preferred stock | 0 | $ (7,328) | $ 7,328 | 0 | 0 | 0 | 0
Conversion of preferred stock (in shares) |  | (12,214) | 12,214 |  |  |  |
Buyback of preferred stock | (9,719) | $ (656) | $ 0 | (9,063) | 0 | 0 | 0
Buyback of preferred stock (in shares) |  | (1,093) | 0 |  |  |  |
Net income | 5,732,573 | $ 0 | $ 0 | 0 | 6,144,062 | 0 | (411,489)
Exercise of options | 17,777 | $ 1,277 | $ 0 | 16,500 | 0 | 0 | 0
Exercise of options (in shares) |  | 2,129 | 0 |  |  |  |
Dividends declared | (4,628,203) | $ 0 | $ 0 | 0 | (4,628,203) | 0 | 0
Foreign currency translation adjustment | 0 |  |  |  |  |  |
Stock-based compensation | 593,426 | 0 | 0 | 593,426 | 0 | 0 | 0
Balance at Dec. 31, 2017 | $ 156,021,377 | $ 20,093 | $ 8,951,321 | $ 86,405,387 | $ 53,105,196 | $ (549,555) | $ 8,088,935
Balance (in shares) at Dec. 31, 2017 |  | 33,488 | 14,918,869 |  |  |  |

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