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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock | Additional Paid-in Capital | Treasury Stock | Retained Earnings | Non-Controlling Interest | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 33 | $ 7,612 | $ (243) | $ (2,411) | $ (89) | $ 4,902
Balance, shares at Dec. 31, 2017 | 32,778,040 |  |  |  |  |
Adjustment for ASC 842 Adoption at Dec. 31, 2017 |  |  |  | (6) |  | (6)
Stock option exercises |  | 86 |  |  |  | 86
Stock option exercises, shares | 236,957 |  |  |  |  |
Stock-based compensation expense |  | 63 |  |  |  | 63
Treasury stock |  |  | (1,757) |  |  | (1,757)
Treasury stock, shares | (408,254) |  |  |  |  |
Net income |  |  |  | 1,920 |  | 1,920
Balance at Mar. 31, 2018 | $ 33 | 7,761 | (2,000) | (497) | (89) | 5,208
Balance, shares at Mar. 31, 2018 | 32,606,743 |  |  |  |  |
Balance at Dec. 31, 2017 | $ 33 | 7,612 | (243) | (2,411) | (89) | 4,902
Balance, shares at Dec. 31, 2017 | 32,778,040 |  |  |  |  |
Adjusted Balance, shares | 32,271,367 |  |  |  |  |
Adjustment for ASC 842 Adoption at Dec. 31, 2017 |  |  |  | (6) |  | (6)
Balance at Dec. 31, 2018 |  |  |  |  |  | 9,291
Balance at Mar. 31, 2018 | $ 33 | 7,761 | (2,000) | (497) | (89) | 5,208
Balance, shares at Mar. 31, 2018 | 32,606,743 |  |  |  |  |
Stock option exercises |  | 67 |  |  |  | 67
Stock option exercises, shares | 130,000 |  |  |  |  |
Stock-based compensation expense |  | 53 |  |  |  | 53
Treasury stock |  |  | (211) |  |  | (211)
Treasury stock, shares | (66,513) |  |  |  |  |
Net income |  |  |  | 2,418 |  | 2,418
Balance at Jun. 30, 2018 | $ 33 | 7,881 | (2,211) | 1,921 | (89) | 7,535
Balance, shares at Jun. 30, 2018 | 32,670,230 |  |  |  |  |
Stock option exercises | $ 1 | 21 |  |  |  | 22
Stock option exercises, shares | 49,782 |  |  |  |  |
Stock-based compensation expense |  | 76 |  |  |  | 76
Treasury stock |  |  | (1,078) |  |  | (1,078)
Treasury stock, shares | (334,414) |  |  |  |  |
Net income |  |  |  | 2,591 |  | 2,591
Balance at Sep. 30, 2018 | $ 34 | 7,978 | (3,289) | 4,512 | (89) | 9,146
Balance, shares at Sep. 30, 2018 | 32,385,598 |  |  |  |  |
Adjusted Balance | $ 34 | 8,157 | (3,675) | 4,864 | (89) | 9,291
Balance at Dec. 31, 2018 |  |  |  |  |  | 9,291
Stock option exercises |  | 8 |  |  |  | 8
Stock option exercises, shares | 21,832 |  |  |  |  |
Stock-based compensation expense |  | 140 |  |  |  | 140
Treasury stock |  |  | (171) |  |  | (171)
Treasury stock, shares | (52,000) |  |  |  |  |
Other | (8) |  |  |  |  |
Net income |  |  |  | 2,350 |  | 2,350
Balance at Mar. 31, 2019 | $ 34 | 8,305 | (3,846) | 7,214 | (89) | 11,618
Balance, shares at Mar. 31, 2019 | 32,241,191 |  |  |  |  |
Balance at Dec. 31, 2018 |  |  |  |  |  | 9,291
Warrant exercises (in shares) | 40,366 |  |  |  |  |
Treasury stock, shares | (52,000) |  |  |  |  |
Balance at Sep. 30, 2019 | $ 34 | 8,884 | (3,846) | 11,409 | (89) | 16,392
Balance, shares at Sep. 30, 2019 | 32,533,597 |  |  |  |  |
Balance at Mar. 31, 2019 | $ 34 | 8,305 | (3,846) | 7,214 | (89) | 11,618
Balance, shares at Mar. 31, 2019 | 32,241,191 |  |  |  |  |
Stock option exercises |  | 129 |  |  |  | 129
Stock option exercises, shares | 166,623 |  |  |  |  |
Warrant exercises (in shares) | 40,366 |  |  |  |  |
Stock-based compensation expense |  | 158 |  |  |  | 158
Net income |  |  |  | 2,162 |  | 2,162
Balance at Jun. 30, 2019 | $ 34 | 8,592 | (3,846) | 9,376 | (89) | 14,067
Balance, shares at Jun. 30, 2019 | 32,448,180 |  |  |  |  |
Stock option exercises |  | 34 |  |  |  | 34
Stock option exercises, shares | 85,417 |  |  |  |  |
Stock-based compensation expense |  | 258 |  |  |  | 258
Net income |  |  |  | 2,033 |  | 2,033
Balance at Sep. 30, 2019 | $ 34 | $ 8,884 | $ (3,846) | $ 11,409 | $ (89) | $ 16,392
Balance, shares at Sep. 30, 2019 | 32,533,597 |  |  |  |  |

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